ISSPRO R8588 User Manual
Page 2
Form No. IS074 (9/10/02 Rev. C) Page 2 of 5
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 /REV NOT KNOWN: Connect the tach as shown in the diagram and run the engine at a constant speed.
Have an assistant monitor the engine speed with a photo tach. Set the switches while comparing the reading to that of the
photo tach. Start with switches off, work down from switch #8, testing each switch in sequence. If the tach reads too low,
turn off that switch and proceed to the next one.
TRIMMING CALIBRATION: Units are factory pre-calibrated. Normally, trimming will not be needed. However, use
the following procedure, if necessary: Set calibration switches as close as possible to calibration setting and install tach
(see below). Run engine at a constant speed while an assistant monitors RPM with a phototach. Insert jewelers
screwdriver in calibration hole (see diagram) and adjust needle indication for correct reading. Do not force the adjustment
past the stop as this will damage the potentiometer. Check RPM accuracy at other points on the scale to verify calibration.
INSTALLATION: Mount the tachometer in the dash panel and connect the wires as described below.
Make all your connections to the Black plug supplied and then
plug it into the tachometer’s white connectors.
RED – Connect to ignition switched power source.
BLACK – Connect to ground along with one of the sensor wires.
WHITE – Connect to other sensor wire.
GREEN – Connect to dash lamp power.
INSTALLATION HINTS:
1) Wire both sensor wires back to the connector. Don’t connect the sensor ground wire to a point which is physically
different than the speedometer ground.
2) When power is applied, the needle should go to the zero position. If it doesn’t, 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.
3) Low voltage (below 10.5 volts) will cause inaccurate reading. Determine accuracy by comparing reading with
phototach. If problem exists, measure voltage with vehicle operating and meter connected. This can be done by
connecting a voltmeter to power source (i.e. fuse block, etc.) and/or by connecting the voltmeter leads to the red and
black wires where they enter the tach’s white connector.
4) If tach reads zero, then “jumps” to normal reading after a repeatable RPM, adjust the sensor in closer to gear
(generators cannot be adjusted).