I've a 75 bay with iffy fuel tank reading. I'd like accurate readings for a long up coming road trip. My fuel gauge correctly reads full when full, but it reads empty by the time it's only about half empty. Thus for the entire second half of the fuel tank the reading says it's completely out but of course there's about 30L left. I had the sender out a while back and it seems to float correctly from empty to full so I expect it's a problem with the gauge, or is there a voltage regulator there too? I'm pretty poor with electrics but I read on another thread that there are some screws that you can adjust to calibrate the gauge? Is that what I should be tinkering with, and if so, can anyone tell me how, or provide a link to some good info on it? Bentley doesn't seem to say much on the topic of calibration, except send it to VDO at 116 Victor Ave. Detroit - helpful! Am I on the right track?