Technical Switch for Flathead Temps

Does anyone have a switch that they could recommend for me to run dual temp sensors into 1 gauge?

An amazon or ebay link (if allowed) would be appreciated.

Also, some wiring advice for a novice would also be greatly appreciated

Thank you

 

A three terminal on on switch. Middle terminal to gauge.

 

Thank you!! I think I found one on Amazon

 

I have the stock gauge in the left head, & an under dash gauge in the right on my '39 Ford. The stock gauge reads cold-hot. Not a lot of help.

 

Search Single Pole, Double Throw.

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