I don't know about the Westach, but the Princeton can be calibrated. I think the models start at 2 positions and the advanced has 5 positions. They sample the level for 60 seconds and report to the gauge in 60 second intervals, to keep the needle from bouncing around. The calibration is "push button", and the lesser expensive models have the calibration on the end of the probe, outside the tank, and the advanced model has the electronics with the calibration mounted remotely from the probe. I will have an access door near the tip end of my tanks so I can get to the module for re-calibration if necessary. This probe could have been mounted from the root end to the tip end, if I had room to put it there and still be able to pick up the last of the fuel, which is the most important quantity for me to know.
See N64KR at http://KRBuilder.org - Then click on the pics See you at the 2011 - KR Gathering in Mt. Vernon, Il - MVN There is a time for building and it never seems to end. Daniel R. Heath - Lexington, SC -----Original Message----- My only hassle is trying to get to the probes to calibrate them. The other probes that Aircraft Spruce sells claim "push button" calibration.