> does the TR4 have a voltage regulator?
It should have. And if it is the original type, Guy will see the voltage
jumping around. The "regulator" (aka "stabilizer") only controls the
average voltage to the gauges; the actual voltage from it at any instant
will be either full battery voltage, or nothing.
However, there are aftermarket replacements available that do deliver a
constant 10.0 volts.
If the problem is that the gauge seems to read about 1/4 tank too high, then
I would definitely investigate the voltage stabilizer first. The original
type uses an internal heater coil that can burn out or go open, causing it
to deliver full battery voltage all the time.
-- Randall
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