I own 95 F-150 with only 73,000 miles on it, I dont travel much. 5.0 v8 with dual tanks as soon it hits 3/4 full the gas gauge starts bouncin. It drops a 1/4 when i take off from a light an slowly comes back up. It does it on both front an rear tanks. Put in new instrument cluster recently so I can have the tach, old one didnt have one.