I can't remember if the sender has higher resistance at full or empty. If higher at full with a lot of fiddling around with some resistors or maybe with a variable rheostat you could get it set to read correctly towards empty. But it could be fussy. I guess the easiest way would be to put a known quantity in the tank like 2 gallons and then try to get it adjusted to read correctly.
Paul L.
On Sunday, April 9, 2017 at 12:20:51 AM UTC-5, MO wrote:64 Dodge B body. I installed a new stainless steel 3/8" gas sending unit and a new aftermarket gas gauge in the correct Ohm range.When the tank is full. the gauge reads full for about 50 miles, before the needle starts to move. When the needle gets to " empty" there is still about 5 gallons of gas left.That is not all bad, but what can I do to get it a little more accurate? ......................................MO