Paul,

If you're using a resistor to drop 12 volts to 6 that may not even be necessary. When I ran my now-restored '36 Chevy PU as a "rat rod" with a 12 volt system and the original 6 volt gauges back in the 1960s a knowledgeable old hand told me the 6 volt gauges would work fine on 12 volts. In about 5 years and 50,000 miles of trouble free use as a daily driver that proved to be correct. Now it's restored and back to 6 volts with the same gauges.
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Ray