I know autozone sells a complete retrofit kit for $30 (I bought it for the rx-7). You need to have the system vacuumed out first to remove the remaining r12. You can then swap out the dryer filter. Then you put a r134 adaptor on your low side valve (comes in kit). After that start the car and ensure the ac compressor is engaged, connect the can of regridgerant/oil to the low side port, then let the system suck the stuff from the can. I'm pretty sure you want to reach about 50 psi. The instructions that come with the kit are a lot better than me decribing it, but this is the basics.
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