Hi JVC. To be honest I don't know.

I live in the UK. In all the time I was involved with aircraft, well over 40 years, airspeed has been measured in MPH or Knots & altitude has been measured in Feet. Many of the aircraft used here nowadays were manufactured in the US. I imagine the airlines have their own requirements but in my experience, private & GA aircraft would use the instruments fitted by the manufacturer. This would be practical for spares procurement.

French & German manufactured aircraft used to have metric instruments fitted as standard. The throttles on French aircraft also worked in the opposite direction to normal. I don't know if this is still the case.

I don't know much about commercial flying at all. I would have thought the FL system is the international standard used by ATC all over the world. This is based on altitudes in Feet. It would be somewhat confusing if this varies depending on the country you're flying over.

As for those Russian aircraft in FS I would think the practical solution is to use a different panel with the gauges you're used to - or simply swap the gauges.

i have seen a few pictures on Anet claiming they were using Meters in singapore as it was the way they worked. since most modern commercial planes have the option for both and pilots who dont prob have a convertor to help.since i dont know for sure i wont put it as a gaurentee

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This would of course be ideal & avoid possible mistakes. In fact I believe it is usually the case with commercial aviation, just as English is the international language used for radio communication.

A lot of things would be easier if we all used the same measurement systems & spoke the same language but we don't. From personal experience, incorrect conversion from one to the other is responsible for a lot of accidents.

As I said earlier, I think this is already the case with commercial & possibly military aviation. For example: flight level (FL) seven zero = 7,000 feet. This is internationally recognised ATC procedure.

This might not apply to light or GA aircraft flying local VFR. Some aircraft would be fitted with whatever the preference is in that particular country. As Bones mentioned, the gliders he flies have metric instruments.

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Most of Europe has used the metric system for many years. The UK is now officially metric but the speed limits on our road signs are still in mph & some things like milk & beer are still sold in pints. I think there might be a riot if they suggested changing this. It's a very strange situation as with most things here. Neither one nor the other. You get used to being messed around after a while but it can be confusing, even for the locals.

Being of the pre-metric generation I still think & work in the old Imperial values. I know how far a mile is & what an inch or a foot looks like without getting out a tape measure but never could visualise a kilometre.