Ah, that's not...strictly...true, Mr President.
Ok, it's not part of any of the original choppers, and I know it's not something for the purist, but there is a freeware hover gauge that you can download and add in to your Panel config.
If you go to the Hover Control website and search their downloads for the HC075DI Hover Gauge. It was designed for FS9 but I think I've seen it used in FSX models too (I'm pretty sure the UKMil Chinook for FSX uses it).
If you're not familiar with doing something like this, let me know and I'll get a hold of the gauge myself and see if I can draught up a step-by-step set of instructions for you.
Regards,
Voodoo