[masraum]

Originally Posted by A930Rocket

The factory temperature sending unit is on the back of the engine under the intake. Without taking the intake off, it’s impossible to get to it. Even if I could get to it, I don’t know if I could split it into two senders.

And on top of that, you wouldn't want to add any sort of T or Y fitting. The probe on the senders needs to extend into the flow of coolant. An extra fitting would likely stop both the original and new from reading correctly. With something like oil pressure, it's no big deal, but with temperature, I believe it's pretty important.