writes:

The high temps displayed on the old gauges will change if the electrical
load is changed.
....
There's a bad grounding connection between the engine and
firewall.

Concur.. Any time weird unrelated [electrical] interactions happen;
ALWAYS suspect bad grounds.

Clean the connections; protect the surfaces, use sharp lockwashers,
etc....


--
A host is a host from coast to
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433