In article m, william_b_noble
says...

I have one of those meters on my 56 porsche. if you really want to regulate
it to 6V, use a 7805 chip and a capacitor - that will give you very
accurately regulated 5V (which will be fine with the meter) for about 50
cents.

Two capacitors - one on the input and one on the output.
And use a 7806 - which will regulate at +6 volts.

Jim

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