In wheel test mode manually turn the wheel clockwise a few revolutions (so that it's calibrated) and then *slowly* turn, stopping the instant it transitions to the next space/wedge. This corresponds to the left edge of the space/wedge displayed on the screen (because you were turning clockwise). Without moving the wheel apply the decal such that the arrow on the PF is pointing at the black line representing the left edge of the displayed space.
Do a couple of practice runs using tape. You want to be dead balls on otherwise the wheel won't be very accurate.
Wilmington, VT
