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Message: <blockquote data-quote="Mustang5L5" data-source="post: 1585761" data-attributes="member: 30520">What's your ambient (outside) temp, as ideal pressures vary based on conditions.25psi low side/185psi high side would be ideal for ambient temps of 50-55 degrees.If you are 80-85 degrees, you want a charge that gives you about 40-45psi low side and 200 psi on the high side.   100 degrees would be about 50-55psi low side and 250ish high side.  You really want to charge based off weight and adjust, but not everyone has the right equipment to do this so rule-of-thumb with pressures might be the best some can accomplish. Keep an eye on things but you might need to add more at some point.  Regardless, if you topped off, you have a leak you need to track down.</blockquote>