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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 effect 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° towards horizontal with the electrical connection upwards, see below.
Minimum mounting angle for the UEGO Sensor
Configuring Calibration Outputs
If a different O2 sensor calibration is desired, the AEM calibration can be changed to
one of three available. The AEM default position is (P0) if an AFR Gauge was
purchased and (P1) if a Lambda Gauge was purchased. These settings implement a
linear calibration with the most useful voltage range possible (0-5V). The AFR
calibration (P2) is linear and similar to (P1) with a slightly smaller voltage range (1-2V).
The AFR calibration (P3) emulates the Autronic Wideband O2 Sensor calibration (0-1V).
The AFR calibration (P4) emulates a non-linear Nernst Cell calibration (0-1V). Refer to
the Table and Graph for specific calibration details.
To change the calibrations, a precision flat head screw diver is needed. Locate the
small hole located on the back of the AEM gauge, as shown below.
Calibration position screw location
With the screw driver, clock the rotary switch into the desired calibration position,
referring to the diagram below, and watch the alphanumeric readout, which will display
the new position when entered.
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