ISSPRO, INC. 2515 N.E. Riverside Way, Portland OR 97211
Telephone: (503) 288-4488 Toll Free: (800) 888-8065
FAX: (503) 249-2999
Form No. 233B (2/4/03Rev. B) Page 1 of 2
R8907 Sensor Kit
For 5.7 Liter GMC Diesel Engine
Using R8503 Tachometer
INSTALLATION INSTRUCTIONS
1) Scrape away the paint from two areas directly across from each other near the front of the vibration damper as
shown on the back page. Roughen the bare metal with an emery cloth. Clean the magnets and bare metal on
damper with alcohol to remove any oil or grease residue so that the glue will bond. Glue each magnet to the
selected surface of the vibration damper with the BLUE SIDE OUT (north pole) and with the magnets
directly across (180°) from each other. Be sure to align the magnets with the front edge of the vibration
damper to avoid interference with the timing bracket.
Suggested method for glue application:
Apply the glue to the area on the damper where the magnet will set, then apply the accelerant (crush tube)
to the magnet face (non-blue side), then apply the magnet to glue area on damper. Be sure to apply
enough glue to fill the gap between damper and magnet. Repeat for other magnet. Let glue set for 10-15
minutes. Follow the instructions on the glue packet enclosed in your kit to allow the proper glue curing
time before starting the engine.
2) Remove one of the front oil pan bolts and use it to mount the Sensor Assembly. Position the sensor so that
there is approximately ⅛” to ¼” clearance between the end of the sensor and the magnets.
3) Connect two #20 AWG wires (not supplied with the kit) to the two sensor wires and route them into the cab
to the tachometer. Locate wire away from the starter cables, electric motor wires, etc. Secure the wires along
as necessary. (See NOTE below.)
4) Mount the R8503 Tachometer (4,000 rpm) in the desired location using the optional bracket or other
mounting device. Connect the wires coming from the 4 wire cable as follows:
a) White wire to one of the sensor wires.
b) Black wire to the other sensor wire. Ground this connection as close as practical to the tachometer head.
c) Red wire to a fused ignition-switched +12 VDC source.
d) Green wire is only used on tachometers equipped with alarm. (See alarm instructions if applicable.)
5) Connect the wires from the tachometer light as follows:
a) One wire to vehicle dash light circuit.
b) The other wire to clean ground.
6) Start the engine after double-checking all connections and clearances. The tachometer should now read the
engine RPM. No calibration is necessary.
NOTE: If only half the engine RPM is being displayed, check to make sure that two magnets were installed
and that both magnets are lined up with the center of the sensor. Also check that both magnets were
installed with the same pole out by comparing them to a third magnet. Both magnets should repel the same
pole of the third magnet. If a flicker or other interference is noted on the tachometer, reroute the extended
sensor wires. This should remove the interference. In severe interference cases, it may be necessary to use
2-wire shielded cable for the sensor wire extensions. Be sure to ground the shield at one end only.
(3 pages)
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