ISSPRO R8540 User Manual
Page 2
Form IS121 (Rev B 5/10/02) Page 2 of 4
FREQUENTLY USED SENDERS
#PULSES PER TURN
DATCON 4-D-C 71267
8
DIXSON SG201A, SG201A1, SG202
2
ENGLER 870-0588
15
ISSPRO R8970, R8940
30
KIENZLE-ARGO 8-161-237008
8
MOTOROLA 4-100 (7SG100), 4-111 (7SG100B)
30
ROCKWELL 240R02-001
30
SUN Model CP7643
6
SYNCHRO-START Minigen
30
TELEFLEX 9604276
8
VDO (Old Style Engler) ISSPRO 300092
4
ZEMCO 4710
8
ZEMCO 6314
5
Alternator Tap Input: If a tap from the alternator has been provided, it can be used to provide the input signal.
# Pulses / Rev = # Poles of Alternator X
Dia. of crank Pulley
2
Dia. of alternator pulley
# Pulses Per Engine Rev Not Known: Switches #9 and #10 are to remain OFF at all times. Run the engine at a
constant speed with an assistant monitoring RPM with a phototach. Start with only switch #8 ON. If the tach
reads LOW, turn OFF switch #8 and turn ON switch #7. If the tach still reads LOW, turn OFF switch #7 and turn
ON switch #6. If the tach reads HIGH, leave that switch ON and go to the next lower switch. Repeat the sequence
for all remaining switches. (Note: Power must be cycled for different switch setting to be recognized.)
Installation: Mount the tachometer in the dash panel and connect the wires as described below.
Red - Connect to ignition switched power source.
Black- Connect to ground.
White- Connect to signal (+).
Green- Connect to signal ground.
Installation Hints:
1.) When power is applied, the needle should go to mid scale, then to the zero position. If it does not, there may
be a bad connection in the “Hot” (red wire) or ground wire circuit. Check power to the meter by measuring
with a voltmeter at the plug (meter leads on the pins that attach to the red and black wires.) If there is power at
the plug, the problem is in the gauge.
2.) Low voltage can cause an inaccurate reading. If inaccuracy is suspected, measure voltage with the vehicle
operating and meter connected. This can be done by connecting a voltmeter to a power source (i.e. fuse block,
etc.) and/or by piercing the red and black wire insulation with the meter leads.
3.)
If tach reads zero, then “jumps” to normal reading after increasing RPM, adjust the sensor closer to gear to
increase signal strength (generators cannot be adjusted).