ISSPRO R8480M - Manual (Page 2)

If the number of cable turns per mile (or kilometer) is not known, follow this procedure: Obtain a ratio tester and
correct drive tang for your transmission. With a steel tape measure, mark off 1/10th mile (528 ft.) (or kilometer
[1000 meters]) in as straight of a line as possible. Mark start and stop lines with chalk or paint. Position the
vehicle so that one of the wheels aligns with the start mark. Disconnect the speedometer cable at the transmission
and install the ratio tester in its place. Secure the cables and reset the ratio tester. Drive the vehicle to the stop
point positioning the selected wheel on the stop mark. The reading displayed on the ratio tester is the number of
cable turns per mile (or kilometer) if using an Engler "SAC-10". If using an SS White ratio tester (P/N 312-
12175Y), multiply the reading by 10 to obtain the cable turns per mile (or kilometer.
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 *
*Note: These senders do not produce the minimum required number of pulses to be in calibration range when
driven at 1000 turns per mile (or kilometer). It may be necessary to change your sender to one that generates more
pulses per rev such as an ISSPRO R8970.
Installation: Mount the speedo in the dash panel and connect the wires as described below:
RED – Connect to ignition switched power source.
BLACK – Connect to ground and sensor wire (-)
WHITE – Connect to sensor wire. (+)
GREEN – Connect to dash lamp power.
VIOLET – 2 speed axle (no connection if not used)
(Connection to positive gives correct MPH (or KPH) reading with 0.733 axle ratio change.
A 0.680 ratio available on special factory orders.)
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 inaccurate reading. If inaccuracy is suspected, 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
piercing the red and black wire insulation with the meter leads.
3.)
If speedo reads zero, then “jumps” to normal reading after a certain speed, adjust the sensor in closer to gear.
(generators cannot be adjusted)
Form IS129 (Rev F 10/25/2012) Page 2 of 7