Kenth
It does look like a TCS transmission switch as you and cammerjeff indicate.
The manual says that all engines except 4 spd manual use the Speed Control Spark Advance (S.C.S). which is controlled by speed and the TCS transmission switch is used for manual transmission cars
There is also mention that cold engine operation (below 95 degrees) and hot engine operation (above 230 degrees) will provide vacuum advance but would seem to use the temp switch located between cylinders 6 & 8 for that determination.
While the PS 7M5 head is original to the engine and the 455 YC block is code and casting date consistent for the car, the engine VIN (Pontiac plant) doesnt match the car vin (Lakewood, GA plant) so maybe the engine was replaced with one from a manual trans car at some point? Dont know. I've owned it since June 1987 and am only the second owner
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