Hi, all..finally got my son's 91 up on ramps, found the elusive coolant switch on pass side cyl head, as many helpfull posts have said...nothing attached to it, burnt off, etc....gonna get one of those corvette 160 switches , I think...I found a hanging wire with missing terminal, wire is green/w white stripe..this is the correct wire, right?? I also found some sensor in the block, just above the oil pan, same side...is this an oil temp switch??? It's lite blue.....This is a 5 speed man....the only lite blue I see in daigrams are for autos??? Any ideas??? Thanx....Dana

 

That's the knock sensor.

 

That sure makes sense.....Thanx.....Dana