A/C Pressure reading

[kqresq]

I'm out of practice and can't find my book My 94 Explorer is reading 24psi on low side and 345psi on the high side at 108 degrees ambient and 75 degrees coming out of the vent. Is 345 a little high or am I just a little low on 134a?

 

[kqresq]

After letting it set for an hour I went back and checked the guages again. 150psi both sides static. I started her up and had 24psi on the low side and 325psi on the high. I said "Screw it! I have a 30lb can of 134a and money in my wallet so let 'er rip"!
I raised the idle to 1800rpm and added 134a till the low side read 40psi. That turns out to be about 50psi at 700rpm. High side reads 345-325psi and the center vent is blowing at 60 degrees. I'm calling it good.