IQ3 Data Logger Dash Installation Manual
30
Driveshaft Collar and Sensor
The drive shaft rpm sensor and magnet kit includes a two piece collar with two magnets, an
rpm sensor, and a mounting bracket used to mount the sensor to the vehicle. The rpm sensor
is a magnetically sensitive sensor that is polarity sensitive each time a magnet passes in close
proximity. The two magnets in the split collar thus provide for a two pulse per revolution rpm
signal.
The first step in installing the kit is to determine where the split collar will be mounted.
Normally the split collar is mounted on the pinion shaft/yoke. However, it can also be mounted
on the transmission tail shaft/yoke. If your transmission and/or bell housing is removed
frequently, you should mount the collar on the pinion shaft/yoke. Thus avoiding possible
damage to the sensor during clutch, and/or transmission service.
After you have selected a location, position the split collar over the shaft, and fix the collar onto
the shaft by tightening the two bolts connecting the two collar halves. Tighten the two bolts
equally such that the gap on both sides of the split collar is equal. This will ensure the magnets
are 180 degrees apart.
Next, secure the mount bracket, and rpm sensor to the vehicle as shown below. The mount
must be installed to a solid member of the vehicle that does not move relative to the placement
of the split collar assembly. This will prevent contact between the sensor and the split collar.
Insert the rpm sensor in the slotted hole in the mount bracket, and position the rpm sensor
such that the sensor is centered over the magnet in the split collar. Next, adjust the gap
between the end of the rpm sensor and the split collar between .050” to .100”. Secure the
sensor by tightening the two jam nuts located on the sensor.