I decided to move my hood tachometer issue to a more specialized heading other than "general" Long story short from my other thread I have a repop tach that is not reading. It lights up but no needle movement. I have not tried the recommended "mechanics fix" hitting it to see if the needle is stuck. I want to know what readings I should get from the harness. I got one ground. one 12v power and the coil wire is showing power when engine is running with a test light. I do have a meter but have not read exact voltage. I assume the voltage should vary as something has to make the needle move? Before I contact the seller and tell him what a piece of sht the thing is I want to make sure I have everything correct

BTW I got the tachometer from the parts place as recommended. It is my second unit from them, the first one came and there were three melted/smashed edges on it, so I will be pissed if I have to return and wait for another one