Ive swapped out my fuel sending unit and my gauge reads 3/4 tank when full and when its at E it probably has around a quarter tank left. ive checked the gauge before installation and it has an ohm rating of 10/75 full/empty. the guy i spoke with at spectra(manufacturer) insists that is the proper specs for a stock 77dodge b200 fuel gauge. my van is a "factory custom" but all the pictures of 77 dodges seem to have this same fuel gauge. what are some causes of my improper reading do you think? should i check the lead from the unit to the gauge and see if there is an improper resistance reading due to wire breakage/corrosion at connections? has anybody had this same issue? the sending unit i put in looks like it has calibration tabs on the float arm closest to the unit, to change where the arm stops at full and empty. the guy at spectra says the unit does not come with calibration capabilities and i should not mess with the tabs , as they will not change the resistance reading. thanks for any insight on this issue. also tank is a stock 22gallon i think. i replaced the sending unit ground and sanded the chasis where it connects, next i need to check at the gauge to see if im losing resistance along the run, but not sure how to check it unless its completely full or empty.