O/2 sensor light on (88 trooper II)

Does anyone know how to turn the oxygern sensor light off on a 88 isuzu trooper II 2.6 engine. Installed new sensor and light is still on. Have disconnected battery, but light came on as soon as I reconnected battery.
Thanks Charles
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charles bridges wrote:

if you search via groups.google.com you will find it's often posted, small screw behind instrument cluster
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