Fuel level senses on 63 and earlier use a different wattage I beleave . I found that out when i changed mine a couple of years ago . Make sure you have one for 63 or older
still does the same may pull it out and put in the original. it also seems to stay on full till that tank is almost empty then will drop to empty with out warning.. when i have it out of the tank it works fine when i move it by hand it must be catching on something inside. (new tank)
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Surrey BC
1963 Acadian Beaumont Sport Deluxe http://www.63acadian.com/
Are you using pump unleaded? There was a problem with Chryco's, Fords and then GM's that used unleaded. GM used a fuel system cleaner to alleviate the problem. Could that be happening to yours?