DesertRatCA

I have a 95 jeep Cherokee 4.0 inline 6 cyl. the ac cycles on and off rapidly same with the condenser fan in the engine bay .i hooked a gauge to it and the needle was wrapped all the way around and wasnt blowing cold at idle. then gave it some gas and it started blowing cold and not cycling as much then i hooked up the gauge and it showed it was almost to the red line. so im not sure if its low or over charged. and it does the same all over again. and the gauge i have came from the sub zero r134a can from autozone. any help will be greatly appreciated..