Give Ebay a look for R12. Lots of it. Around $20 per 12 oz can.
Seller will ask you for a declaration that you will forward the product to an authorized installer. That's all.
Stock hoses, rotary compressor, new receiver dryer and properly evacuated. Held 29" vacuum for over 24 hours, so I charged her up.
I used 3 12 oz cans and a +/- 6 oz can with an oil charge about 4 years ago. Still blows cold.
Also added a binary switch to protect the system from problems with pressures outside the operating norms. I would use a trinary switch next time for condenser fan control too.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.