Cant figure out what sensor this is, I stripped the hell out of it and it still wont come off. This is from a TPI.

 

coolant temp sensor

 

Bit of a understatement
You might have to cut it off and carefully drill through it with bigger drill bits until you can break it out with out damaging the threads

New CTS

http://tpiparts.net/inc/sdetail/498

 

On the older TPI systems there is also a 9th injector temp switch down there. It's not a sensor, it's actually just a temp activated switch.

It's easy to tell apart from the CTS. CTS takes an oval 2 wire weatherpack connector, 9th injector switch takes a rectangular 2 wire plug.

Just thought I'd throw that in. I can't remember which hole takes which, but they're right next to eachother.

 

Unless they have been swapped ,the CSI switch is on pass side and has the same style connector as the injectors

CTS shown circled in pic .CSI switch to left

 

So the sensor that I f'ed up is the one I need and the other one is for the 9th injector that I dont need cause Im running a 89 ecm? (Not worried about the TPI manifold, The sensors are for my HSR manifold.)