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If you have a laptop check all sides to see if there is a switch to turn it on, if not look at the keyboard and see if there is a wireless icon on any of the keys .If found Press the FN key and the wireless key to turn on.
The fuel sender unit could be faulty. It says 1/4 tank even though it is almost empty. Carry a jerry can of gas in the back , and run it down to 1/4 or less to see if the problem repeats itself.
The gas guage and trip computer are only as accurate as the float in the tank.
to calibrate you need to have an area 75 to 100 feet in distance. place laser on tripod 20 feet from one end, take measurements on short and long end, then move laser to center of range and take measurements on both ends . the distance between both sets of marks should be within + or - 1/4 inch if not move level screw to move beam to center then center bubble
If you take a tape measure and step from the wall at exactly 10 feet, you will be able to turn the calibration knob to the same exact distance. All other distances from that point on will be precise. Thank you, Dana
pick up and throw out. purchase new one. If the tape head or foot. (End grabby bit) has broken or moved to far the tape will not read accurate. So if youre using a tape that has to be calibrated or has to be accurate its useless.
I would say from the sound of it, that it is loose and sloppy or dirty. You can clean and tighten it up but I do not know how much exposer you have had in calibrating. I would be glad to take a look at it and more than likley fix it for no charge. I was a Tool & Diemaker for 25 years and am now retired. I would ask that you supply return postage on a return box.