I have found in the 1972 Pontiac Service Manual pages 6D-5 to 6D-9 is a desciption of the "Controlled Combustion System", S.C.S./C.E.C./T.C.S. and figure 6D-8 shows the S.C.S. Temperature Transmission Switch. Looks like your switch.
In your car the S.C.S. (not T.C.S.) would be used and the temperature sensor at the back of the head may be a part of this system. It will provide vacuum spark advance when the speed exeeds 38 m.p.h. or with engine temperature below 95° and above 230°.
The S.C.S. (Speed Controlled Spark) was a 1972 one-year only system with a special plunger for the special speedo gear.
HTH
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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