I would like to point out that if I were to build another flight sim, I would simply go to the junk yard and salvage old gauges from junk cars. You can reverse engineer these things to suit your needs and only spend maybe a couple bucks. Free if the junk yard doesn't check your tool box completely. 
I filled a 5 gallon bucket once with gauges and switches of all sorts and the guy charged me like 10 bucks. Just stay away from classic junk yards. Find one in your area that cares more about volume of scrap metal and they could care less about those damn parts.