12 volt tach on a 6 volt positive ground system

[adileo]

Originally Posted by tubman

The short answer is "Yes". The power booster units we use are adjustable to use input voltage from 3.0 volts to 30 volts. You do raise an interesting point, though. We may need to know the coil voltage for each order. In the alternative, the output voltage is adjusted by turning a small screw that could be set by anyone with a modicum of skill and a multi-meter.

Count me in for one that will work with 4 volt Helmet coil.