The single wire sensor on the driver's side of the block is the sensor that goes to the guage. The other sensor at the thermostat outlet neck is the PCM temp input. That is used by the PCM to determine whether enrichment is required for cold starting, cold engine shift points as well as convertor lock-up once the engine is warm, etc.
Not sure of what your brown wire does but the Blue LS connector pins # 19 and 75 require an ignition switched power supply.
Last edited by Mickeymotormount; 04-13-2013 at 04:43 AM.
'93 Chevy 1500 4X4 ECLB with a '99 Silverado LQ4 6.0 and '99 Escalade 4L60E. SOLD IT!!
New toy: 2001 2500 HD 4X4 Extended Cab Long Bed
John
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