In article , axolotl says...

For the amount of current you are talking about, put a 6.2 volt Zener
diode with the requisite power rating (probably written on the meter, if
not you will have to measure the current draw) in series with the meter.

I would probably go with a three terminal regulator like
a 7806 for this application. Though, the zener might work.

He could also just put 7 or 8 silicon diodes in series
to drop the six volts.

Jim

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