[Dave at Pelican Parts]

Strictly for the FI. No CHT gauge from the factory. The aftermarket CHT senders have a very different connector and wires, so this isn't one of those.

The wire reminds me of the CHT sender wire on the passenger's side... Yeah, it really does look like the sender wire to me! It wouldn't be the first time that someone swapped the heads side-to-side and then drilled a hole in the engine tin for the wire.

I'm betting that's what it is. If it has about 2000-3500 ohms resistance from that plug to ground when the engine is cold, that is what it is.

Does the car have FI? Does it have a CHT sender on the passenger's side??

--DD