What should high & low side pressure be for A/C?

[Ron Brooks]

Before I bought my 1988 300SE last year, the prior owner had the car converted to 134a. All the requisite parts were changed and the work was done by a reputable Mercedes shop. I saw receipts for thew work. I want to make sure the system is charged properly. I bought a nice set of gauges to check both the high and low side. Now my only problem is that I can't find any information as to what the pressure of my converted system should be with the car off and with the car running and A/C on. So, anyone know what the pressure should be so I can use my nifty new gauges?

Thanks,

Ron Brooks