Again Larry, Thanks. I have not worked on any A/C in about 10 years since a friend owned a shop and owed me money. I had to run around and remember which friend borrowed what tool so I could get them back. I had to side line my car hobby for a while but I am back in the fun again. Anyway I found some references for pressure versus temp but yes I will do it correctly via weight.
At first I thought this conversion was done at the Stealership ( My Dad loved to make a day of it drive from VA up to Bethesda MD where he bought it and leave the car and the 2 of us would grab lunch and maybe hit a bucket of golf balls) But I believe he started using a very good shop in the mid to late 90's .
After I posted last I went out and put the gauges on again and as I pulled them off ( Major thunder/rain storm rolls through) the shut off pin in the center of the low side connector stuck a little and lost gas for 2-3 seconds until I used a steel punch just to reset it. That little bit of gas lost and then the compressor would not engage. I have put over $500. in maint in the last 60 days just bringing necessary items up to spec as well as for a baseline going forward so I am hoping all is well with the A/C other than flush, and fill.
Also the USPS just dropped of my full Viton fuel line set so I can start on that when the rain lets up. God I wish I had rolled the 911 and the 500E into the driveway before I started this.
Thanks
Alan

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92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )