Fuel guage not working
My 75 cj5 fuel guage isnt working. After inspection I noticed that there is a connection on the back that isnt connected to anything. I installed a new tank and sender. The jumper is there that goed to the temp sensor. I am getting 12 v reading on that. The pink wire to sender is hooked up to the passenger side terminal. The driver side connection is not hooked up but I am getting a 12 v reading from it. I have read that this goes to the ignition but why if I already have ignition voltage. I briefly hooked a hot wire to this and it did nothing. I guess Im not sure what the purpose of this is. Also what voltage goes to the sender, 12v?