My stock temperature gauge doesn't work, my car seems to run okay now but I have no idea other than putting a thermometer in my cars radiator while idling. I would like to install the Sunpro water temperature gauge that I recently bought. The current sender on my car seems to be a 65 style thin sender, which is installed on the manifold toward the radiator side. I read that the mustangs have two places for a thermostat sender on the manifold, is that true, I wanna install the gauge for peace of mind. So that I would be running two gauge, as the one that is connected to the stock gauge is smaller than the the sunpro thread.

 

You'll need a brass fitting to allow both senders to seat.

I did one on my '83 many years ago with good results.