> Need some opinions on what I think might be a problem with my 1969 TR6
> water temp gauge is an electrical unit.
Well, that's your first mistake, IMO. For racing, I would definitely
replace that thing with a 270 sweep mechanical unit.
> Does it gradually go bad and give false readings?
If this is the stock TR6 gauge, I would suspect the voltage stabilizer;
which is a little metal can on the back of the speedo (I think). The gauge
is voltage dependant and expects a 10 volt (average) supply. The VS chops
up the voltage from the battery, to create a long-term 10 volt average to
the gauge.
-- Randall
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