Amp guage

I have a 1969 Camero Z28 with 4 guages near the shifter. The amp meter quit working, when you apply a load like a blinker or lights, the guage does not move.

What could be the fix to this?

Replace the amp meter. Or find an electronics shop that can fix it.

Check the wiring too… something may have come loose or be corroded on a car this old.