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