AEM 30-5143 Analog E85 Wideband UEGO Gauge E85 AFR - Manual (Page 3)

Page 3
Sensor Mounting
A weld-in M18 X 1.5 boss is supplied for sensor installation. Mount the O2 sensor in the
exhaust system at least 18 inches downstream from the exhaust port. If you anticipate
high EGT's (over 800C), run a turbocharger, run at high RPM for extended periods of
time or plan on running leaded race fuel then you must mount the sensor at least 36
inches or more downstream of the exhaust port as all of these can cause the sensor to
overheat. On turbocharged engines the UEGO sensor must be installed after the
turbo charger, if not, the pressure differential will greatly affect the accuracy of
the unit. For accurate readings, the sensor must be mounted before catalytic
converters and/or auxiliary air pumps. To prevent collection of liquids between the
sensor housing and sensor element during the cold start phase, the installation angle
should be inclined at least 10° from horizontal with the electrical connection upwards,
see below. (Figure 2)
Figure 2. Minimum mounting angle for the UEGO Sensor
Changing the Bezel
The AEM UEGO Gauge comes with the black bezel installed. However, a silver bezel
is also included in the gauge kit. To change the bezel, orient the gauge so you are
looking at the faceplate. Rotate the bezel counter-clockwise to unscrew it from the
gauge cup. The bezel, glass lens, and rubber spacer are all removable. Reassemble
the gauge as shown below in Figure 3. Do not over tighten the bezel when
reassembling the gauge.
Figure 3. Changing Bezels
>10°