[DeTomaso] A/C Question

[Art Stephens]

     I have already added 75 ounces of 134 refrigerant to my newly converted system.  The gauges don't climb above 20 psi on the low side and 210 psi on the high side,  in 90 degree weather.  What gives?  My instructions say I should see higher numbers.  Do I just keep adding more?  At ten bucks a can,  I figured I better start asking some questions.  The air blows cold,  but I could stand colder.
Art