I know there was a UDPSpeed guage set for the Comanche helicopter because I had it. Unfortunately don't have it now. I think there was a set for the Havoc as well.
Good hunting !
DickDastardly made the set for EECH. There was one for the Comanche, the Havoc, & the Hokum.
They were developed based on the original (Retro) CommServer and not the updated (Firebird) Commserver.
They had some issues with the some things not working but those things have since been corrected. I'm sure they could be easily updated.
If the links still work, they used to be here... Comanche UDPSpeed Hokum UDPSpeed Havoc UDPSpeed