65 A Bodie fuel & temp gauge problems

It looks like someone modded it for a later style IVR. That must not be a 65 Valiant, because my 65 Valiant had the IVR that plugged into the cluster from the factory. That one appears to be like Del said with the IVR being integral to the fuel gauge, but somewhere down the line someone put that plug in IVR on it. Probably because the one in the fuel gauge failed.