I found a WWII aircraft tachometer at the swap meet and picked it up for 15 bucks,I thought the price was right even if it doesnt work. Well, out of couriosity, I hooked it up, and it moved. It did not read right, but it still moved. So Iam thinking the thing needs 24 volts to work right, and I have a 12 volt system. Does anybody know if this can be made to work for a v8 12 volt system?