O2 sensor problem!
 

Okay, so on my wiring harness (87 7mgte A/T) the plug for the o2 sensor has 3 wires (3 prong) and when I go to the store to replace it I get one that has 1 wire (1 prong). where can I get the o2 sensore with the 3 prong without paying a fortune?? also can I do some splicing to make it work?? what are the 3 wires for?

Also, not related to the o2 sensor, but I swapped the turbo 7m into my na body. is there any modifying i need to do electronically? like gauges, etc..

Thanks for the help! much appreciated!

3 wire: ground, pre heat power, & ecm voltage.
Try EBay for a replacement. OEM will be in excess of $100.00.

Which wire is which? Im buying a sensor with the wires but no connector, so im gonna splice it.

Have you bought the TSRM, which I sugesteded?..No?
Black = Ground
Red = Heater, ECU
White = ECU