Are these the same as Ford V8 Temperture sensors

[horsa]

That type goes into the left head when looking at the engine with the fan in the front. The right side used a sender that has two prongs sticking up on the end. Wire from the gauge goes into one prong and then a separate wire goes from the second prong and over to the sender on the opposite side of the engine.

Your gauge monitors the left head only as the readings are passed on through the right side sender. But if the right side of the engine gets too hot, it trips the right side sender and then it reports it own status back to the gauge.