[Bleyseng]

The other temp sensor is for the cold start valve mostly. It tells the ECU that it is cold enough to turn on the cold start valve when starting (below 40')
If the insulation on your CHT is brittle it is probably bad so replace it, they're fairly cheap but important.
Why test the TPS? Take it off and pop off the cover and look at the tracings to see if they are worn. Look for groves/lines in the brass strips, if so toss it. A new one makes for smooth engine operation.
Geoff