an easy test is to disconnect the spedo cable from the back of the gauge and get it in a position where you can see it when you drive, go for a drive and see if its moving. If not moving its broken and you will need to find a replacement. I would stay away from the universal replacements try to find one that works for an early a . I have not had to search for one for years. But back then there were no good new replacements. I had to go junk yarding to find a replacement. Make sure when you put it back in you lube it up real good use oil. I also used to use graphite .
