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Diagram B
VDO Programmable Tachometer Dimensional Drawings
3¹⁄₈" (80 mm)
3³⁄₈" (85 mm)
4" (100 mm)
3¹⁄₈" (80 mm)
3³⁄₈" (85 mm)
4" (100 mm)
3.32" (84 mm)
3.56" (89 mm)
4.16" (104 mm)
Tachometer: “A” “B”
Sensor Installation
The sensor necessary to provide the signal to your new
VDO Tachometer is not included. This sensor is avail-
able from your auto parts dealer. (Part numbers for VDO
Hall Effect Sensors are: 340 011; 340 012; 340 013; and
340 014. The VDO Generator Sensor is Part #340 001.
VDO’s Inductive Sensor is Part # 340 020.)
1. Refer to Diagram B for dimensions. The 3 ¹⁄₈ " (80
mm) tachometer requires a hole diameter of 3 ¹⁄₈"
(80mm); the 3 ³⁄₈ " (85mm) tachometer requires a hole
diameter of about 3 ³⁄₈ " (85mm); and the 4" (100 mm)
tachometer requires a hole diameter of about 4 " (100
mm). If you are mounting the tachometer into an existing
panel, remember that the panel cannot be more than ¾"
(20 mm) thick. Minimum mounting depth is 3 ⁹⁄₁₆ "
(91mm).
2. Careful measuring is a must for proper mounting of
your tachometer. An improperly placed hole would be a
costly mistake, so measure everything twice.
REMEMBER: THERE ARE NO SECOND
CHANCES ONCE YOU HAVE MADE YOUR
HOLE! MEASURE TWICE... CUT ONCE!
3. Cut the hole. If you do not have a hole saw the exact
size needed, use the closest
SMALLER size, and carefully
widen the hole with a half-round file or other similar
device.
4. Note: If you plan to calibrate your tachometer, perform
this step LAST! Place the tachometer in the opening and
secure it with the supplied VDO Spin-Lok clamp as
shown in Diagram C. You may also mount the tachometer
using an optional VDO mounting bracket and nuts.
I. Mounting the Tachometer
1. Prepare insulated ¼" spade terminals for use with the
tachometer. Make sure all wires are long enough to
reach the necessary positive and negative terminals and
any wires from the sensor.
2. Connect the wire from pin #4 to a switched +12 volt
or +24 volt source. A switched +12 or 24 volt wire can
be found coming from the ignition switch. Follow this
wire to a junction, and attach the wire from pin #4 at
this junction (i.e. fuse block, etc.). Refer to Diagram D.
3. Connect a wire from pin #5 to a constant +12 or +24
volt source.
4. Attach the wire from pin #3 to a ground (negative)
source. One such source can always be found where the
battery is attached to the metal frame of the vehicle.
Use an appropriate connector to ground this wire.
5. Attach the wire from pin #8 to the positive (+)
tachometer signal source [usually a terminal on the ig-
nition coil or the generator in a diesel system] using a
butt splice and a crimping tool.
6. Attach the wire from pin #7 to the negative (–)
terminal of the sender or floating ground [usually a
terminal on the ignition coil or the generator in a diesel
system] using a butt splice and a crimping tool.
7. Crimp a spade connector onto a short wire, and
attach the connector to a terminal on one of the sup-
plied lamp sockets. This lamp socket is referred to as
Socket A.
8. Crimp the other end of the short wire, along with
II. Wiring the Tachometer
¨
[text continues at # ]
The VDO Programmable Tachometers featured in
this installation manual are available in three diam-
eters: 3 ¹⁄₈" (80 mm); 3 ³⁄₈" (85 mm), and 4" (100 mm).
All tachometers can be programmed to function with
gasoline engines or with diesel engines, and can be used
with most ignition coils. These instructions describe
the installation, wiring, calibration and operation of all
VDO Programmable Tachometers..
Each tachometer’s analog display clearly shows the
number of revolutions per minute, and the LCD display
shows the accumulated engine hours. This display is
also used in the programming , calibration and fine tun-
ing of the VDO Programmable Tachometer.
Signal pulses needed by the tachometer are provided
by the ignition coil, an alternator [AC tap], a Hall-
Effect sender, or an inductive sender, depending on the
type of engine. If you are not sure where to tap the
ignition to get the necessary signal, consult your operator’s
manual or contact the engine manufacturer.
General Information
CAUTION; Read these instructions
thoroughly before installing the
tachometer. Do not deviate from
assembly or wiring instructions. Always
disconnect the battery ground before
making any electrical connections.
If in doubt, please contact your dealer
or VDO North America at (540) 665-
2428.
Diagram A
VDO Tachometer with Hourmeter is programmable
from .5 to 200 pulses per revolution
VDO
VDO
Item Description Quantity
1. Tachometer 1
2. Lamp Socket (Push in, wedge-type) 2
3. Light Bulb (12-volt / G.E. #161 or equivalent) 2
4. VDO Spin-Lok™ Mounting Clamp 1
5. Installation/Operation Instructions 1
Parts List
These instructions contain information
about gauges of different sizes.
You
must determine the size of your gauge
before cutting any holes!
CAUTION!!!
Tools and Materials Needed For Installation:
Hole saw or jigsaw (may not be needed)
¼" spade terminals
Miscellaneous electrical connectors
Philips and/or flathead screwdriver
Pliers and/or wrenches
Crimping tool and/or soldering iron
(may not be needed)
Tachometer Installation and
Operation Instructions
for Programmable Tachometer with Hourmeter
Instruction Sheet # 0 515 012 037
Rev. 03/01
INSTRUCTIONS FOR THE INSTALLATION AND OPERATION OF THE PROGRAMMABLE
TACHOMETER ARE CONTAINED HEREIN. USE IS RESTRICTED TO 12-VOLT OR 24-
VOLT NEGATIVE GROUND ELECTRICAL SYSTEMS.
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®
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