[Canadian 72 C15]

Originally Posted by LockDoc

Yes, for the temp gauge. Some of the later engines may have had a sender in the T-stat housing but I think the '72 was still in the drivers side head. Not sure about the Canadian models though.

There is a port by the #8 plug also but you very seldom see a temp sender in that location. Do you have a temp sender in the drivers side head by #1 plug?

LockDoc

I do yes but this is a 305 and the casting number says it’s from a 80-85 model year GM. But yes it does have a spade connector sensor there at #1