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CAUTION !!!!
These instructions contain information about gauges of different sizes. You must determine the size of your gauge BEFORE
cutting any holes. Read these instructions thoroughly before making the
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
(540)-665-2428.
IMPORTANT:
Mounting dimensions vary for different gauges. Please be certain to follow the
instructions for your specific gauge as described in the following paragraphs.
PARTS LIST:
One of the following: (1)80mm - 3
1/8" Programmable Tachometer or (1)85mm - 3 3/8" Programmable
Tachometer or (1)100mm - 4" Tachometer
Two (2) Lamp Socket (Push in, wedge type)
Two (2) Light Bulb (12-volt / GE #158 or equivalent)
One (1) VDO Spin-Lok Clamp
One (1) Installation Instruction Sheet
Tools and Materials Needed for Installation:
16 Gauge stranded, insulated wire
Insulated 1/4" spade connectors
3 1/8", 3 3/8" or 4" hole saw
Drill and drill bit set
Half round file
Tape measure or ruler
Small tools: wrench or nut driver, utility knife, pliers, etc.
Tachometer Installation:
(1) Select the location where you will mount the gauge and mark a center point.
(2) Cut either a 3 1/8" or a 3 3/8" or a 4" hole, depending on
the size of the tachometer you are installing. If the gauge is to snug, use a
file to slightly enlarge the opening. See diagram below.
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(3) Slip the VDO Spin-Lok Mounting Clamp over the back of the tachometer. It's direction depends on the thickness of the panel (Diagram B listed above). Tighten the clamp until the tachometer can no longer be rotated by hand. CAUTION: DO NOT OVER TIGHTEN!
Wiring the Tachometer:
(1) Run wires from the tachometer
location to a positive 12 volt power terminal. (This positive
power source MUST BE SWITCHED, and should be protected by a fuse); the light
switch (also after the fuse box); a good ground location; and the location of
the signal source (alternator, coil or other ignition signal source).
(2) Connect the wiring to the appropriate tachometer terminals as shown in
diagram D below.
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Configuring the Tachometer:
Before your VDO Tachometer will function properly with your engine, you
will need to configure it as shown in Diagram C (see below). the table at the
top shows how to set the DIP switches for use with an ignition coil; the table
at the bottom shows how to set the DIP switches when using the tachometer with
an alternator. Note that manual fine tuning can be done using the potentiometer
on the rear of the instrument. (See Diagram A). NOTE: This procedure should
be done by an experienced mechanic ONLY, using a hand held reference
tachometer. Fine calibration can be made between 30% and 100% using this fixed
reference.
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At this point, the installation and wiring of your new VDO Programmable
Tachometer is complete. Turn on the ignition and the lights in the car and
check to see that the instrument and light work properly. If they don't,
re-check your wiring, referring to Diagram D.