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Your correct about the altitude sensor. It should be an open circuit till 1,000 meters. When above that it closes the contacts and leans the mixture.
I live in NY where it would never be necessary, and drove an '86 engine with no sensor installed on my car and it worked perfectly.
As far as the cylinder head temperature sensor, I had installed the newer style 2 wire sensor before I put the engine in my car. There were occasional issues with the original single wire unit, that is why Porsche updated it to the 2 wire unit.
When the full throttle switch engages it uses a different map and makes the mixture richer, bypassing the O2 sensor and shutting off the A/C.
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Ed
1973.5 T
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