Xplane in - mV out for real gauges

Hi guys!

with our SC7 sim now so so working of course one of the next questions is what to build next :D
one of the most likely things that well do in the future of our sim I think will be real gauges instead of monitor behind bezels.

being a newbie at sim building I've been looking for ways how to get real gauges for our sim and because we have access to the real gauges from an old Skyvan I'm wondering if interfacing the real thing isn't the best solution.

A lot of the gauges in the Skyvan cockpit are mV or just plain bus DC Volt driven needles like:

Ammeters
Voltmeters
Fuel quantity
Fuel Flow
oil PX / temp
Oat
EGT

Is there some solution that can talk to Xplane and output a certain voltage for a certain dataref value?

cheers
Phillip