The patient is making progress...the gauge is an xml one, from the default DH88. I had not bothered with that plane until yesterday, but I fired it up, and surprise, surprise that gauge goes backwards too!
Since then I have found several variants of the same gauge. Only one of them moves around the range on the dial as I think they are all meant to. Since the xml code for moving the needle looks identical (albeit with different names for the gauge), I now think other engine parameters are not adding up to the right numbers to drive the needle the right way. :think: There was a time when I got paid for this sort of thing, but now it is like the old Sc C E Highers...'Analyse Pymblechook's epic poem and say why you like it ' (! -no option there, if you gave your honest opinion you were shot at dawn

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Age and low cunning will always prevail.
MikeW