How many volts does the stock tach run off of? Is it 5V or 12V? Reason I am asking is because I was thinking about using this to get my V6 firebird tach to work with my ignition module from an 87 grand national.
http://store.summitracing.com/partde...5&autoview=sku

But they said that it is for aftermarket tachs that require 12V and most stock tachs require only 5V and that it might fry it. But I had another person insist that the stock tach on my 91 firebird requires 12V and that it won't fry anything. So does anyone know for sure? Will this work?