See this thread:
http://forums.maxperformanceinc.com/...ght=prong+unit
The three prong switch is solely used for the Transmission Controlled Spark emission control system. The temp sending unit is located on the intake manifold on a 1971 model.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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