70 chevelle ss....i have just finnished converting my idiot light dash to gauges. i modified the harness to the gauge harness specs, but now i think i have a problem. everything seems to work fine but when the key is off the gas gauge goes to way overfull. when the key is on it reads to the full mark, which i think may be OK because i do have a full tank of gas. shouldn't it be reading below empty when the key is off? thanks in advance.