[AZKen]

Don't think that green wire goes to ground. The ground terminal is if you have a hot light instead of a gauge. Unless you have both. Do you have an actual ACC position on your switch. Like full CCW?
At any rate, that is not important. The green wire that is important is the one from the temp sender to the gauge. But you said you were going to trace the green wire(s). The 64 and 65 diagrams are basically the same. Slight changes.