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Last time I checked R12 was not too expensive at around $25 a pound last time I checked. Really expensive though if you pay a reasonable shop mark up. There are online tests you can get a mobile license to buy it.
Run a really long vacuum. Set of R12 gauges are not expensive new on EBAY.
The pressures will be ambient temp specific. Wieghing it in can help get to close also.
I work on residential and light commerical HVAC for a living. I only work on mobile air when I really have to.
Of course replace the drier. R12 is really easy to work with and can hold up very well.
john
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