"I have a used instrument cluster with the attached voltage regulator, I will install that device... "

Hey, give it a shot. Some varieties of regulator used the tab on the case for a ground, so don't just hook up two leads. If the little bi-metal strip is going open and closed, it may give you a funny reading on a meter. On a digital,the numbers will jump around a lot. On a good old fashioned analog meter, the needle may quiver and jump. That is a good reading. Of course, an oscilloscope would give you a picture of exactly what is happening - but that is overkill even for me.

It was interesting to see the interior. By '52, the pushbutton doors had given way to the conventional handles.