How many lbs of refrigerant are needed in a 1985 gs AC system? Our AC machine services by the LB. Also how much oil is injected in the system?

Thanks...

 

R-12, 22-25ozs. or 1.4-1.56 lbs.
134a, ^ x 80%

Oil 6.2ozs.

I tried charging using the sightglass, but something wasn't right(certain parameters ambient temp/settings), close to 3 12oz. cans, it's cool.

 

Thanks alot good info...

 

Servicing... Well, my compressor and dryer were recently replaced with victoria british units. Looks like both servicing ports are on the compressor??? I've never seen this before. Is there another port hidden somewhere? I looked down by the dryer and on the lines and found nothing.

My gauges and vac pump are suppose to arrive tommorow. And I'd like to be positive before I go and ruin something.

 

That's how mine was, til I had new lines made with extra ports.
It should be fine as long as you charge with gas only, don't tilt the can and allow liquid into the compressor (theoretically).