Quote Originally Posted by jerry clayton View Post
5v is a computer type thing---you don't have the correct matching parts--simplest way for me to tell you to fix it is to buy a guage/sender combo from an reputable company---or go to a mech guage because you are coming up short on the PIE stuff----
Jerry's right (as usual), if your gauge is a 1967 unit it's going to be looking for a 12V feed with the variable resistor controlling the current. Sounds like maybe you have a more modern sending unit, meant for an ECU vehicle? Where did you get the 5V information?