Faces are essentially 3.25" which means likely the hole size is 3-3 1/8". That being said I'm going to go with the speedhut 3 3/8" gauges for the speedo and tach and the 2 1/16" for the fuel and oil temp. I can't do them all at once but Ill post up pictures in the build thread. If anybody is looking for the SW gauges I'll be glad to send them to members of this site for shipping cost only.