User Guide

9
Synchronized Chuff Patterns for RIM READING for 4 chuffs per revolution.
Cut pattern that suits wheel diameter and cut large enough to cover inside flange. Mount pattern
on inside flange (clearing center axle from pattern). Trim excess beyond flange. Align optics to
read pattern. Any external light shining on the optical sense end will cause improper readings.
RIM READING for 2 chuffs per revolution
Remember to shield the optic from stray light entering the pickup end. If light does stike the
sensor it can overcome the infra-red reflection creating the loss of exhaust chuff synchronization.
Synchronized Chuff Patterns for Reading an Axle
6.5mm
20.6
7mm
22.14
9/32"
22.44
7.5mm
23.6
5/16"
25.0
8mm
25.1
6.5mm
20.6
7mm
22.14
9/32"
22.44
7.5mm
23.6
5/16"
25.0
8mm
25.1
RIM READ
- shown mounted
inside truck.