Hello, I have the following problem for which I need professional help: In my Ford F100 (Bj. 68) an amperemeter is installed. In Ford the resistance for the amperemeter was installed somewhere in the wire harness. Some had no shunt at all, here the resistance was simply generated by a precisely defined cable. As far as so good…. or not…. The amperemeter (but one of Ford for this vehicle) was installed afterwards, and was never connected. So the wire harness with the shunt is missing. However, if I understood this correctly, it would not be right any more, since the current alternator delivers 130 amps. How can it be calculated now, which resistance I need, so that my amperemeter indicates correctly?? I do not want to install another amperemeter, because the vehicle is in an original condition, which I do not want to change either. Greeting from the Ranchero65 who relies on your expertise.