hello everyone, so today my problem is that when ever you turn the key on to start the truck the gauge goes way past full and it will stay there as long as the keys in the ON postion, but when you turn the key off it slowly goes back down to about 1/3 of a tank and will rest there. i have a 1995 bronco with a 351w in it if it helps. the prevouis owner said they had replaced the sending unit about 10-15 years ago i think and from day 1 the gauge has been messed up. so what do you guys think do i need to drop the tank and out in a new sending unit or could it be a bad float, or could it be a bad ground somewhere and if it is then where would the ground be? let me know what you guys think. thank you!