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Reman is ok I guess, better than used I would think. Is the refrigerant R134a? If so the oils is polyester and will suck up moisture like a sponge if left open. You should change the drier if possible, but in a pinch you could dry it out in the oven at about 150 for a couple hours. Keep in mind this does nothing for cleaning out the trash. The orifice should be in the small line just before where it goes into the firewall. There will be a nut in the line and a funny shape where it goes in. Take the nut loose and pull it out with needle nose pliers. This can be cleaned out with brake clean and compressed air. DO NOT blowout the system with compressed air. That will just contaminate the system with moisture. The longer you keep the vacuum pump on it the better. Moisture boils at a lower pressure and that will help insure a clean dry system. Yes the gauges can be calibrated. Remove the face and turn the small screw either direction till the needle is on 0. Make sure the hose is open to the atmosphere.
we are doin ac in class right now, pretty simple stuff really! I love the old R12 systems, the freon is spendy but it will throw out around 39 degrees from the vent if you have a TXV system (thermal expansion valve) system then you have an accumulator and if you have a FOT system (fixed orifice tube) then you have a receiver/dryer..... i believe your yota has the FOT, and yes I would replace the dryer.
Why not put power to the relay and check to see if it comes out the right post?
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