Yes on the ammeter and the temp gauge & any gauge of that type must have continuity across it for it to function/register. on the temp gauge you hookup 2 AA batteries in series across it & if the gauge is good it'll read very close to halfway. I did my 65 Dart gauge but I dont have the note I took on the hookups/polarity cuz there are (3) terminals plus the polarity (I'd Google it)