I converted my 53 Chevy to 12V a few years ago. Did everything right. Kept the original dash gauges, and used the 12v to 6v reduction resistors on them. Oil pressure and temp work fine. Fuel gauge, however, which worked fine before, is acting silly. Car off, goes to E as normal. Turn the ignition on, it goes all the way up to F. Start the car, it goes back down to E. Have about a half a tank of gas. Any ideas?
-CP