Soon, I will be calibrating the capacitance fuel gauges in my RV-7 and at the same time thought I would also calibrate the fuel gauges on the AFS 4500. In your Installation and User's Manual, version 6.6, on page 68, under "Fuel Tank Calibration," step 2, it states to "Verify that the Tank is Empty." A simple question---Verify that the tank is physically empty (no fuel in it) or just indicated empty on the 4500?


Terry