Ron,
I understand the one you're talking about but the one that we're talking about doesn't look anything like the engine/car regulator.
I'm trying to remember location, definately behind and attached to the gauge pod or back of the dash.
Feet up on the back of the seat, head down, under the dash, good flash light in hand and you should be able to spot it. I'm thinking it was between the ampmeter gauge and the speedometer. 40 years ago was a long, long time ago!
DV