I have a blue non-AR faceplate that has proven to be adequate under all circumstances. Even with the sun shining directly on the faceplate through the rear window, I can still read the screen. The sun actually illuminates the cross-hatch pattern of the display matrix, yet the data are readable.

I have exactly the same thing. The blue non-AR that came with the unit was indeed blue and easy to read, the green AR is great and very easy to read.
Is it possible to test the VFD prior to installation on the assembly line. The VFD gets patched in to a test rig, is illuminated and measurments are taken. the unit is then accepted or rejected.
Tony, how about a FAQ for changing the settings of the dimmer for those who are flying blind. ie * -> -> ok ->-> etc

the other thing to try is turn the lights on and see if there is a display then. The settings may be 0% for normal and 60% for nighttime.

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Murray 06000047