Switch kicks on at 30 and off at 50 like it is set to but water runs for 2 minutes or so then water stops and have to wait 10 to 15 minutes usually for pressure gage to drop to 30 and kick pressure switch in builds back to 50 kicks switch off like it should water continues to run for about 2 minutes stops again and take 10 minutes to drop and kick switch in again what's going on with it is my gage or switch bad I replased them 3 or 4 years ago

Do you have any filters/softeners on your system?

Replace the gauge. They are cheap.
If you are getting no water and the gauge reads 30#, then it would seem the gauge is bad. With a working gauge, you will have a better picture of what you are facing.