On my 68 XR7 the temp gauge doesn't work and i noticed that the sender units (screwed in to the intake manifold) in some of your guy's engine bays have a one prong/connector (I don't know the proper word for it) but mine has two?? but my wire from the firewall has one connector also!! Could someone clarify this for me?? Also if mine is wrong... what is the correct part number for this temp sender??