In a message dated 14/11/2006 19:22:21 GMT Standard Time, bones@xxxxxxx writes: The only way you can make such a gauge is to ignore TA and build a simple altitude alert gauge. For this you would have to dial in the TA as the alert height and set the trigger to zero rather than 1000ft as in the default AA gauge. In the UK this is the only way you can do it because there is no way the sim will know that the TA for places like London is 6000ft, Birmingham 5000ft and Norwich is 3000ft. Yes I see, I need to build an altitude alert gauge, with the altitude set by the pilot. Its more complex than anything I've done up until now, but I'll do some research. Thanks Bones. Frank T.