That's the exact model machine I just got rid of for $100! BTW, the top unit will unbolt from the cabinet for transport. Only four, 1/2 nut bolts hold it together.
Need an A/C recycling machine to go with it? I have 2 real cheap!
https://www.yenko.net/forum/showthread.php?t=172612
Have you tried to used the exhaust analyzer yet? I'd be surprised if it still functioned - they used latex-based tubing for some of the internal plumbing and they may have turned to dust after this long.