While using my compressor (Husky WL65004AJ) the compressor used to go on when the pressure dropped down to about 85-90 psi. Now it doesn't. The only way that I can build up the pressure again is to shut off the power switch, wait about 3 minutes and then put on the power switch. At this point it will build up the correct pressure. When the pressure drops again, I have to do this procedure all over again. Any ideas on what might be wrong with it?

Hi and welcome to FixYa, I am Kelly. I tried several places too cross this model number: WL65004AJ without success. The pressure switch has 2 settings one for HIGH cutoff and one for LOW cycle on. 1/2 of your pressure switch is not functioning properly. With the proper model number I could find a source for the pressure switch for you. There are a couple of different types of presure switchs, One is a stand alone switch on the air plumbing with no external controls (under $30.00) and one is an all-in-one switch that has the on off switch and air lines connected to it that runs around $86.00. You need a pressure switch.... it is just a matter of finding out which one fits your model and replacing it.
Thanks for choosing FixYa,
Kelly