Should be an easy one.

What should the high/low pressure readings be on my '73 280 SEL? I am getting the system topped off tomorrow at a friends A/C shop and since he isn't a MB tech I would like to have the proper readings for him. Best part is the cost will only be R-12 at his cost. Sure helps to have a friend in the business.

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Mike Tangas
73 280 SEL 4.5