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I think you will find that the Sierra Madre 914 sensor that you referenced is really a switch, not a sensor, so that won't work for you.
There is a sensor from the 911 3.2 that will work (930-606-915-00), but it is not very convenient to adapt, unless you have started with a 3.2L engine.
People who have chosen to use the breather location have used Bosch Sensor# 0280130037.
I have used GM/DELPHI sensor 12146312 for over ten years now. I cut the brass sensor tip off and extracted the sensor. I soldered a two-wire lead to it, and epoxied it to the number three cylinder head fin. I used the alternator lead hole in the fan shroud to route the wire to a connector on my wiring loom.
I also tried the breather location with the Bosch/Audi sensor, which is beautiful from a connection standpoint. From a control standpoint, it was not acceptable, so I abandoned it. I experienced these problems:
1. The oil warms up too slowly, so dec'ing out the start enrichment fuel is overly sensitive, making for rough drive-away from a cold start. If you get it right at warm ambient temperatures, it is wrong at cold ones, and visa-versa.
2. The breather stays warm too long, making hot restarts crank too long. Again, you can fix this for long hot soaks, but then short ones are messed up, or visa-versa.
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