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Installation and Operation Instructions
THE INSTRUCTIONS FOR INSTALLATION AND ELECTRICAL WIRING FOR THESE TACHOMETERS FOLLOW. USE IS RESTRICTED TO 12 VOLT NEGATIVE GROUND ELECTRICAL SYSTEMS.
Item
Description
Quantity
Parts List
1.
Tachometer
1
2.
Decals, 2� x 4�
(not contingency decals)
2
3.
Posi-Lock� Connectors
6
Remote Keypad Cable, 6� #240 207
Flush Dash Mounting Bracket #240 104
On-Dash Mounting Bracket #240 103
Optional Items Which May Be Needed:
Diagram A
Dimensions and Selector Switch Settings
Tachometer
Tachometer Installation
Installing the tachometer is a three-step process.
1. Program the Tachometer
Your Xtreme tachometer is factory programmed 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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VDO
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CAUTION: Read these instructions thoroughly before making in-
stallation. Always wear safety glasses, and always disconnect the bat-
tery ground before making any electrical connections. If in doubt,
please contact your dealer or VDO Instruments at (540) 665-2428.

RPM x 1000
V DO Diagram B
Possible mounting locations for the Extreme Tachometer
2. Mounting the Tachometer
Your Xtreme 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.
REMOTE KEYPAD MOUNTING:
� Remove the four cap nuts, lockwashers and rear cover.
� Pull the keypad cable connector straight out from the
back of the tachometer.
� Remove the two hex bolts, keypad and bracket from
the tachometer.
� Mount the keypad bracket in the new location.
� Connect optional extension cable [P/N 240 207]
between the keypad cable connector and the
connector at the rear of the tachometer.
� Replace the rear cover, lockwashers and cap nuts.
DO NOT OVERTIGHTEN!
MOUNTING CAUTIONS:
� Make sure your Xtreme Tachometer does not rest
against any glass, windshield A pillars, or any roll cage
tubes.
� VDO does not recommend mounting your Xtreme
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
either Diagram C * or Diagram D *.
* Refer to your vehicle�s owner/service manual or the
aftermarket ignition manufacturer�s instructions for
the recommended place to tap the signal. Typical
examples are shown in the table below.
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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
Tachometer close to other electrical components or
their associated wiring. For example, the ignition
system box, the ignition coil, electric fuel pump, etc.
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� Be sure to connect the tachometer wires using the
supplied Posi-Lock� Connectors. Use them as shown
in the following illustration:
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Xtreme Tachometer Operation
1. Setting the Record Length
� Press and hold in �TACH/RPM SET�
while you turn on the power.
� Press the up (s) arrow to change the
record time to 360 seconds, or the down
(t) arrow to change back to 90 seconds
[factory setting is for 90 sec.]. A dot
appears in the Digital Display when you
record and play back in the 360 second mode. Press
�TACH/RPM SET� to return to the tach mode.
2. Setting the Shift Points
� Press the �TACH/RPM SET� button while in normal
[tach] mode. The tach pointer will move to 3000 RPM
[approx.] and a dot will appear in the display to indicate
�RPM SET� mode. �S-1� appears in the display itself
to indicate you are about to set shift point #1.
� Press the up (s) arrow or the down (t) arrow until
the display reads your desired RPM value.
� Press �TACH/RPM SET� again to save this value.
The display will show �S-2� briefly, then it will show
the second shift RPM value.
Repeat the above procedure to set or change your
desired second shift RPM value.
� Press �TACH/RPM SET� again to save this value.
The display will now show �S-3� briefly, then it will
show the third shift RPM value, if there is one.
Repeat the above procedure to set your desired third
shift RPM value.
� Press �TACH/RPM SET� again to save this value and
return to the normal [tachometer] mode.

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NOTE: If only one shift point is required, set the second
and third shift point values to the same value as the
first shift point value. If two shift points are required,
set the third value the same as the second.
Diagram C
General Wiring Information
Diagram D
Xtreme Wiring for Circle Track/Road Racing Applications
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ALL FUNCTIONS OF
THE TACH REMAIN
THE SAME AS OUT-
LINED IN THE TEXT OF
THIS INSTRUCTION
SHEET. VDO Instruments
.
188 Brooke Rd.
.
P.O. Box 2897
.
Winchester, VA 22603
.
Phone: 540-665-2428
VDO North America, LLC. warrants all merchandise against defects in factory work-
manship 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 misap-
plication, 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 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 War-
ranty Act of 1975.)
VDO Limited Warranty
3. To Record A Run
� Press the �START� button [or activate
�LINE LOCK / TRANSBRAKE� if
connected]. Once recording has begun,
the display will show the number of the
run being stored (#1 to #4).
� If four runs are stored and the
�START� button is pushed [or �LINE
LOCK / TRANSBRAKE� is activated], the display
will read
If a driver has already started a run when he presses
�START� and discovers the memory full, he has five
seconds to press �START� again to clear the memory
and record his current run. If the driver chooses not
to clear memory at this time, the Xtreme Tachometer
will return to normal mode in 5 seconds. He can wait
until the end of his run to clear the memory as outlined
in Step 5.
� To stop recording, either press �TACH/RPM SET�
or turn off the power. In any case, recording will stop
automatically after the elapse of the
preset time: 90 or 360 seconds.
4. To Recall A Run
� Press the �RECALL� button.
The display will show the default 1:3
[slow motion] setting. If you want to
play back the run in real time (1:1),
quickly [within two seconds] press
�RECALL� again.
� The display will now show the number of the last run
recorded (1, 2, 3 or 4)