Drained the coolant, pulled the blank plug on the back of the thermostat housing and then installed the temp sensor there. Used liquid thread sealer, I’m going to be pissed if this thing leaks. If I did it again I’d just pull the whole housing I think. Using a stubby to slowly tighten it was no fun, nonetheless it’s in.
Then fabricated the gauge bezel from some carbon fiber flat stock. Pretty easy to work with, except cutting the hole for the gauge as it’s tough material to cut through since it gets hot quickly. Took a few breaks and finally got through.
Wired it up to my handy fuse box and tucked my wiring.
Still need to start the car and bleed the coolant system but it’s too cold for that at the moment.