Is there anyway i could simulate a Auxilary Power Unit for a Helicopter, i know FS2004 will only control one engine for the Helicopters what i basically want is when i push a button or switch it starts the APU which increases the voltage and plays a sound. i thought about using doug dawsons sound gauge but i have no idea how to increase the voltage.

HiDo a search for apustrt1.zip on flightsim.com it has a nice APU gauge which may work on choppers CheersMav

IS there a XML version around?

HiNone that I have seen but I see no reason It cant be done in XML there was a discussion here somewhere about simulating a ACU but the link to the example is long dead :(Sorry not much helpWozza