Hey yes i know a mechanical fuel gauge WILL float. but mine when i accelerate hard or soft drops and when i turn on my headlights it drops a 1/4 of a tank Could my fuel sending unit be bad? if so do you guys know where you can buy/find one. BTW i have an 84. Also how do i find out what size tank i have? i thought i had a 33gal but when i filled it last(gauge read "E") i could only put about 20 gals in it? thanks alot!