TCS (Transmission Controlled Spark system) Temperature Switch. Part is called SWITCH, eng. thermo & dist. (or SWITCH, thermo. & dist. vacuum) in the parts book, Groups 1.150 and 2.410, PN 6489712 ('70 V-8 unit), 6490152 ('71 Pontiac V-8 unit, exc. 455 HO), 6490153 ('71 455 HO unit, exc. Rally gauges) and 6490384 ('72 Pontiac V-8 unit and was the replacement unit for all, in the '83 books).
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So long, farewell.
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