IVR in 65 Dart

Does anybody know if the IVR in my 65 Dart is the kind that's built into the fuel gauge or is it the plug-in type? I am going to be taking out my instrument cluster/dash to paint it and I thought if I plug in a new solid state IVR maybe I might get lucky and fix my non-working fuel and temp gauges. This is at the far limit of my mechanical ability but I thought I'd give it a try.