Re: Any adjustment on old dial fuel gauge?
All fuel senders have a specific resistance range. There are several different ranges. It has to match the gauge or you'll never get proper empty to full indication.
A fuel level gauge is just a voltmeter that measures between +12v and ground through the resistance of the sender.
If the old sender is damaged/lost, you can "read" what range your gauge wants with a potentiometer (volume control) from an electronics supply and a multi meter.
Get a pot rated at 500 Ω, connect the left post to the sender connection of your gauge, the middle post to ground. Key on, slowly turn the pot until you see an "Empty" indication on the gauge. Remove 1 wire from the pot, read the resistance between the left and middle posts.
Connect the wire again, then turn the pot to get a "Full" indication. Remove the wire, read the resistance of the pot. Now you have the lower/upper range of the sender your gauge wants. An error of ? 10% is no biggie.
Here's an article on automotive senders/gauges listing some common ranges;
http://www.summitracing.com/expertadvice/professoroverdrive/default.aspx?techQuestion=3679