I am on $780 social security a month so is their a rebuild kit? is it the plates?

I have a 2004 grand marquis 60k I have a freon leak the system was empty I hooked up the gauges and put 90 psi in the system yes it was air and no I did not have nitrogen but I thought the system had air in it all ready so what the hell 0 psi. I started the car and turned on the a/c for 3 seconds ju...