I have read quite a lot of articles about incorrect reading gauges, but only once have I read anything to the fact that some, if not all, are adjustable. Yes adjustable. The gauges on my 65TB and also on a complete set of spares, there is a small hole in the top of the fuel, temperature, and oil pressure gauges. This is where the gauge is adjusted. To get to the fuel gauge, remove the bezel from the gauge by removing the small screw on the bottom of it. Remove the two screws that hold the guage in place and pull the guage out of the case as far as the attaching wires will allow.. Be EXTREMELY CAREFUL not to bend and damage the needle. With a small flashlight, look into the hole and you will see a slot on one side of the part a short distance down in the hole. Opposite this slot is a series of slots that look like small gear. Now, take a small blade type screwdriver that is exactly the right size to fit into the single slot and one of the gear slots at the same time. You may have to grind the screwdriver to fit. With a FULL fuel tank, turn on the ignition, and very slowly turn the screwdriver (and gear slots) until the fuel guage reads full. By doing this, you will be moving the gear type slots and adjusting the needle of the guage. Turn the ignition on and off several times and see if the needle returns to full then to empty (or slightly below). Replace the guage and check again. Just to be safe, take a can of gasoline with you until you can see what the needle is reading when you are close to empty. Also when close to empty, fill your tank and notice how much fuel it takes to fill the tank, therfore you will know how was still in the tank. The tank holds 20 gallons total. The temperature and oil pressure guages do not have numbers, so you can only adjust the needles where you think they should be when you KNOW what the true temperature of oil pressure are. Check these with mechanical type guages to be sure. I realize that these instructions may be hard to follow, so if you have questions, let me know. Don Adcock dja69@msn.com