Thanks Dave. I hope that isn't the case as that is the one thing I am trying to avoid. Other thing is that it says to first connect wires and mount the unit, which doesn't seem to make sense if you were doing it with the tank out of the car. Alternatively I wonder if I fill the tank, calibrate full, then siphon out 50% etc. etc. and calibrate accordingly. Cheers Ron
Edited by Cook, 24 October 2022 - 10:25 AM.