Measure the currently installed CHT sensor first. You can disconnect it in the engine bay and measure the ohms.
You can find the correct values in this post.
http://forums.pelicanparts.com/porsche-911-technical-forum/1052215-verify-my-cht-sensor-test-results.html
For testing purposes on a cold engine you could use a 3.6 Kohm resistor and connect it instead of the real sensor between the pins and see if the engine starts any better ?
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