Tachometer

THE INSTRUCTIONS FOR INSTALLATION AND ELECTRICAL WIRING FOR THESE TACHOMETERS FOLLOW. USE IS RESTRICTED TO 12 VOLT NEGATIVE GROUND ELECTRICAL SYSTEMS.
Parts List
Item Description Quantity
1. Tachometer 1
2. Decals, 2” x 4” (not contingency decals) 2
3. Posi-Lock Connectors 3
Optional Items Which May Be Needed:
Flush In-Dash Mounting Bracket #240 104
On-Dash Mounting Bracket #240 103
CAUTION: Read these instructions thoroughly before making installation.
Always wear safety glasses, and always disconnect the battery
ground before making any electrical connections. If in doubt,
please contact your dealer or VDO Instruments at 1-800-265-1818.
Tachometer
Installation and Operation Instructions
Siemens
Allentown, Pennsylvania USA
VDO
Tachometer Installation
Installing the tachometer is a three-step process.
1. Cylinder Selection
Your PRT Tachometer is factory set for an eight cylinder
engine. For other applications the selector switches must be
set according to Diagram A.
· Remove the 4 cap nuts, lockwashers and rear cover.
· Find your application in Diagram A and set the
switches accordingly.
· Replace the rear cover, lockwashers and cap nuts.
DO NOT OVERTIGHTEN!
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Diagram A
Dimensions and Selector Switch Settings
P/N 0 515 010 561 Rev. 07/03

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Diagram B
Possible mounting locations for the Extreme Tachometer
2. Mounting the Tachometer
Your PRT tachometer can be mounted almost anywhere.
Several suggestions are illustrated in Diagram B. Some
installation techniques may require optional accessories,
cutting, or drilling new holes.
MOUNTING NOTES:
· The most common mounting location is on the steering
column or roll cage using a band clamp and the
included short mounting bracket.
· For mounting in the dash, optional flush mounting
bracket [P/N 240 104] is recommended. The rear
cover may also be used as a mounting clamp for in
dash mounting.
· For mounting on top of the dash, optional longer
mounting bracket [P/N 240 103] is recommended.
MOUNTING CAUTIONS:
· Make sure your PRT Tachometer does not rest against
any glass, windshield A pillars, or any roll cage tubes.
· VDO does not recommend mounting your PRT
Tachometer close to other electrical components or
their associated wiring. For example, the ignition
system box, the ignition coil, electric fuel pump, etc.
IGNITION
Standard
CD
Electronic
TYPE
points/ breakerless
points
breakerless
MSD, ACCEL,
MALLORY, DDIS
(distributorless),etc.
CONNECTIONS
negative terminal on coil
points connection to CD box
positive terminal on coil
Tach output terminal on ignition
box, or points connection to
ignition box, or negative coil
· Be sure to connect the tachometer using the supplied
Posi-Lock Connectors. Use them as shown in the
following illustration:
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3. Wiring the Tachometer
· Turn off the ignition and disconnect the negative
terminal from the battery post if you haven’t already
done so.
· Wire the tachometer to the vehicle as shown in
Diagram C *.
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* Refer to your vehicle’s owner/service manual or the
aftermarket ignition manufacturer’s instructions for
a recommended place to tap the signal. Typical
examples are shown in the table to the right.
· Reconnect the battery and start your vehicle to test
the installation.

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Diagram C
General Wiring Information
PRT Tachometer Operation
For normal operation and display of current engine speed,
rotate the Mode Switch to the TACH position.
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High RPM Recall Operation
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The PRT will store and display the highest engine speed
achieved during a race. The high RPM recall is displayed by
the tachometer pointer when in “RECALL” mode.
1. Display high RPM memory.
· Turn the igniton ON. The engine MAY be running.
· Rotate the Mode Switch to the “RECALL” position.
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· The pointer will move to indicate the high RPM stored
by the tachometer.
· Rotate the Mode Switch to the “TACH” position to
return to normal tachometer operation.
2. Resetting the memory.
· Turn the ignition ON. The engine MAY be running.
· Rotate the Mode Switch to the “RECALL” position.
NOTE: The PRT memory cannot be RESET if
the Mode Switch is not in the “RECALL”
position.
· The pointer will move to indicate the high RPM stored
by the tachometer.
· Press the RESET button.
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· The pointer will drop to zero. (If the engine is running,
the pointer will drop to the current engine speed.)
· Rotate the Mode Switch to the “TACH” position to
return to normal tachometer operation.
VDO North America, LLC. warrants all merchandise against defects in factory workmanship
and materials for a period of 24 months after purchase. This warranty
applies to the first retail purchaser and covers only those products exposed to
normal use or service. Provisions of this warranty shall not apply to a VDO product
used for a purpose for which it is not designed, or which has been altered in any
way that would be detrimental to the performance or life of the product, or misapplication,
misuse, negligence or accident. On any part or product found to be
defective after examination by VDO North America, VDO North America will only
Siemens VDO Limited Warranty
repair or replace the merchandise through the original selling dealer or on a direct
basis. VDO North America assumes no responsibility for diagnosis, removal and/
or installation labor, loss of vehicle use, loss of time, inconvenience or any other
consequential expenses. The warranties herin are in lieu of any other expressed or
implied warranties, including any implied warranty of merchantability or fitness,
and any other obligation on the part of VDO North America, or selling dealer.
(NOTE: This is a “Limited Warranty” as defined by the Magnuson-Moss Warranty
Act of 1975.)
Siemens VDO . http://sso-usa.siemensvdo.com/ . Phone: 1-800-265-1818

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➊ BEGIN HERE
CAUTION: Read these instructions thoroughly
before making installation. Do not deviate from
assembly or wiring instructions. Always
disconnect battery ground before making any
electrical connections. If in doubt, please
contact your dealer or VDO Instruments at 1-800-
265-1818.
General Information:
Your VDO mechanical temperature gauge
features the latest illumination technology
and a rugged design to insure years of durable
and reliable operation. This instrument
may require additional adapters to
complete installation with various engines.
You may purchase these adapters from your
VDO dealer.
Gauge Installation:
1. Select the location where you will mount
the gauge, and mark a center point for a
hole (or use a VDO Mounting Accessory
[1,2, & 3 hole chrome and black] or a VDO
Mounting Cup [chrome or black]).
2. Cut a 2⁵⁄₈" (65 mm) diameter hole for
the temperature gauge. Place the instrument
into the hole. If the gauge is too snug,
use a file to slightly enlarge the opening
until the gauge fits properly. (Diagram A)
4. Slip the mounting bracket over the
mounting bolts on the back of the gauge.
Screw on the accompanying nuts. Tighten
the nuts until the gauge can no longer be
rotated by hand. DO NOT OVER-
TIGHTEN!
Diagram A
Gauge Dimensions
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Parts List
Item Description Quantity
1. Temperature Gauge (2⁵⁄₈" [65 mm] diameter) 1
2. ½" Adapter 1
3. Lamp Socket 1
4. Light Bulb 1
5. VDO Mounting Bracket and nuts 1
6. Installation Instructions 1
CAUTION!!!
The bezel diameter is only a few millimeters
larger than the gauge itself.
With that in mind, measure and precisely
mark the gauge location before
cutting any holes!
Siemens VDO Limited Warranty
VDO North America warrants all merchandise against defects in factory workmanship and materials for a period of 24 months after purchase. This
warranty applies to the first retail purchaser and covers only those products exposed to normal use or service. Provisions of this warranty shall not
apply to a VDO product used for a purpose for which it is not designed, or which has been altered in any way that would be detrimental to the
performance or life of the product, or misapplication, misuse, negligence or accident. On any part or product found to be defective after examination
by VDO North America, VDO North America will only repair or replace the merchandise through the original selling dealer or on a direct basis. VDO
North America assumes no responsibility for diagnosis, removal and/or installation labor, loss of vehicle use, loss of time, inconvenience or any other
consequential expenses. The warranties herein are in lieu of any other expressed or implied warranties, including any implied warranty of merchantability
or fitness, and any other obligation on the part of VDO North America, or selling dealer.
(NOTE: This is a “Limited Warranty” as defined by the Magnuson-Moss Warranty Act of 1975.)
Siemens VDO . http://sso-usa.siemensvdo.com/ . Phone: 1-800-265-1818
Siemens® VDO
Tools and Materials Needed For Installation:
16 Gauge stranded, insulated wire
Insulated ¼" spade connectors
2⁵⁄₈" hole saw
Drill and drill bit set
Instruction Sheet #0 515 011 805
Half-round file
Rev. 07/03
Tape measure or ruler
Small tools: wrench or nut driver, utility
knife, pliers, etc.
Various engine adapters To Begin, go to #➊
Mechanical Temperature Gauge
Installation Instructions
INSTRUCTIONS FOR THE INSTALLATION OF THE MECHANICAL TEMPERATURE
GAUGE ARE CONTAINED HEREIN. USE IS RESTRICTED TO 12-VOLT NEGATIVE
GROUND ELECTRICAL SYSTEMS. LIGHT BULB, IF SUPPLIED, IS 12 VOLTS.

➋ CONTINUE HERE
Gauge Hookup and Lamp Wiring:
1. Drill a ⁷⁄₈" hole in the firewall. Route
the capillary tube from the gauge through
the hole in the firewall to the engine. DO
NOT CRIMP the tubing closed during
routing. A rubber grommet is recommended
around the tubing where it passes
through the firewall.
2. Determine whether you will need the
supplied ½" adapter to connect the capillary
tube to the engine. (See Diagram B)
3. If you do not need any adapters, attach
the tubing to the engine using the ¼" selfsealing
nut. If you need the ½" adapter,
install it in the engine port. Then insert
the heat sensing bulb and sealing nut into
the ½" adapter and carefully tighten the
sealing nut. (See a VDO catalog if a different
type of adapter is necessary.)
DO NOT OVERTIGHTEN THE SEAL-
ING NUTS OR YOU WILL DAMAGE
THE TUBING!
4. Run the wire from the gauge lamp socket
to the lighting circuit (a +12 volt source,
usually after the light switch fuse in the fuse
box). See Diagram B.
At this point, installation is complete.
Recheck the routing of the tube from the
gauge to the engine.
CAUTION:
Make sure the tube is absolutely
free from moving and/or hot
engine components, and that it
is totally free of kinks.
Start the engine and turn on the lights to
make sure the gauge illumination functions
properly. If it doesn't, recheck your connections
and your wiring. Make sure the
housing of the gauge is grounded. Check
all tubing connections for leaks.
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Diagram B
Gauge hookup and lamp wiring information