Get a dc/dc converter or resistor to drop voltage down to 6volt from 12 or check the Hamb classifieds or eBay for old units.
Where can I get the resistor or the dc/dc convertor? Is the convertor what is used when 6v to 12v alt update, for the instruments? Tks
You can't boost 6V into 12V using a resistor, to make 12V equipment run in a 6V system. A DC/DC boost converter (a.k.a. step up converter) can increase voltage. Most other devices such as resistors, simpler regulators and so on can only reduce voltage. I don't know how many 6V tachos there is available, if they work well or what they cost, so I can't tell if you want to go for that or boosting voltage and running a 12V unit.
Check with Williamsons. They redid my old Sun and did a beautiful job. Highest recommendation. https://williamsons.com/services
If you are planning to switch to 12v alternator, you’d also be planning to run a 12v battery. Why not just use a 12v tachometer?
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