Consider getting an aftermarket temp sensor and gauge. If you can, get one of the good ones with 2 wires to the sensor, a stepper motor, and ~270deg of sweep. I went thru a lot of happy-ass gauge solutions in order to find the most expensive and complicated way to do anything. I’d have saved myself a lot of time and money if I’d have bought high end gauges like STACK or it’s Autometer equiv with:
–2 wires to sensor so accuracy not impacted by ground quality
–Stepper motor and 270deg sweep for precise reading of temp with eyeball
–Data out to your data logger
–Programmable gauge color so the whole gauge face can go Yellow or Red at a temp of your choosing
–Programmable threshold out so you can run an external warning light.
Sometimes a person can go cheap and get away with it just fine. But other times going cheap means you slowly increment up buying and installing increasingly capable solutions until finally you end up with the solution you keep because it does everything you want really well. But then you have a pile of your discarded solutions that turned out to be a waste of time and $$.