So, update on this. I went out last night and was able to reach up under the dash, pulled the current regulator out and hooked it up to the battery, had a steady 5v output. Went back under the dash with the Fluke and measured for my 12v supply, that was good. It does feel like the regulator plugs in rather easily, so it must have not had good contact before, think I will pull it back out and put a slight twist in the prongs or something to help it "stick" better. Now the fuel, temp and oil pressure gauge work
Again, thank you all for your input.