Initial experimentation with external shunt ammeter

OK, through 1976, that gauge had the same -40 (/) -40 screen, internal shunt type or not. That's why some owners buy the wrong one of ebay wherever. Ever wonder why the cahnged it for the 1976 model? You can see it in this thread... [FOR SALE] - Standard dash clusters
They placed the amp gauge right above the headlight switch far left end. as their stamp dies etc.. got worse their water leaks got worse. Water leak from windshield seal or wiper pivot would short out the amp gauge and shut down the whole dang car. with remote shunt they could get one more year out of this old a-body. Same water leak might kill the gauge but there product isn't laying by the side of the roads that the Ford and GM drivers are traveling.