Wondering where you guys have put a sensor for a coolant temp gauge. I wanted to put it in the thermostat housing. Plan was to put a "T" in where the current sensor is, but after looking at the 5 different adapters decided the housing wouldn't deal with all the extra weight during race conditions. I'm trying to be the least intrusive while still maintaining functionality.
Setup is a B18C1 head on B18B block.

 

I put mine on the upper radiator hose. It was easy and seems accurate.

 

x2 i got one of these. Worked fine.

 

The B18B block already has a spot for a coolant temp sending unit. It's right in front of the coolant temp sensor and behind a water hose joint. Here's a picture with it circled in red:

 

This is what I did on my B20.

 

Nice idea, Chuck!

 

Can also splice wire into the stock temp sensor...

 

Didn’t notice the first post said B18C5, but the water neck should have a provision for coolant bleeding on it as well making it pretty easy to thread for an aftermarket coolant sensor.

 

I have put mine coolant temp sending unit in the upper radiator hose on my B16a.
I picked up one of these from Hasport: https://hasport.com/store/index.php/...tem/egkha.html
and cut about 1 inch out of the upper radiator hose. Autometer sending unit threads right in to the Hasport hose adapter and I used an old fan switch sensor as the plug for the other hole in the Hasport hose adapter.

 

I removed the thermostat housing bleeder and re-threaded the hole for my sensor. I use a filling funnel to bleed the cooling system from the cap so the stock bleeder isn't necessary.

 

Adapter in the upper hose like the others

 

Wow. Thanks guys, love the help I always get in this thread. I think I'm going to rethread the bleeder valve. Looks almost like it belongs in there also as often as I seem to have to pull the radiator on this thing it's one less thing to fight with.

 

you want temp at the head as thats the damaging temp, thats the key.