Here are 2 possiable solutions for you:They are at www.grainger.com. part
#3KU71  and #3T475. These are on page 3624 of their cataloge. They are
quick release couplings. Just screw one part on the access port and then
use the "bayonet" fitting to stick the hose into the fitting. Screwing on
the gages will unnerve anyone at times. These will allow you to easily
attach gages without loosing any r-12. They are 90 degrees offset. I think
the 2 hoses that attach to the rear of your compressor can be adjusted so
that htey can still give you good access.You will have to loosen them up
though first.