Almost certainly the instrument voltage stabiliser. If the system voltage
were dropping far enough to make that much of a difference to the gauges
there would be other symptoms as well, particularly lights and wipers. In
67 it also fed the electric oil gauge, but it wouldn't affect anything
else - unless it shorted to earth and blew the green circuit fuse. It's a
heated bi-metal strip opening and closing a contact, hence an analogue
device, so this is one of several modes of failure.
PaulH.
----- Original Message -----
>I noticed the gas gauge and the temperature gauge both tend to drift about
> a quarter of the way down from mid range and back again while driving. Is
> this the voltage regulator? Is it getting weak or is it a "works", "don't
> works" part? Or maybe it's not the regulator at all?
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