Congratulations, I would go tire shopping real soon. Twenty year old tires are dangerous. I am a purist and if my Alfa had A/C I would have pulled it off before my girlfriend noticed it and made me drive with the top up on hot days.. BLASPHEMOUS! My opinion not withstanding you can take it to any shop that recharges A/C. I am not familiar enough with your spedo but some white lithium grease on the transmission end can't hurt, give it a good cleaning sounds like some crud is in there.