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I just did this on my 92 and only replaced the drier and the two associated O-rings. The drier was only about $35 from Advanced Auto and came with the O-rings. The retro kit was an Interdymanics with a pressure gauge and 3 cans of R134+Oil. The 92's only had 21-25oz of R12 to start with, so you only need to fill it with 17-20oz of R134. At first, I didn't bother with evacuating the system and it seemed to work, but was somewhat intermittent. The next day, I took it to a shop and paid them $70 to evacuate the system, then refilled with the left over cans of R134 from the kit. It seemed to be more effective, but I didn't get a chance to really test it out since I had to go on a trip shortly after. All told, I only spent $150 or so and will be happy even if it only lasts another couple of years.
Kuoh
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