Why not go all the way and replace the condensor?
Also, which orifice tube are you going to use?
Ester oil, some dye, gas and O rings.
Vac the system for 30 mins...check for leaks, if none, add oil and dye and continue vac for at least 60 mins.
Then add the gas (engine off)
Rotate the compressor by hand several turns
Then start the engine and engage the compressor ( use a jumper at the accum)
Add gas by reading pressure based on your temp
Ac full blast, open windows
The most important is to read the gntype post..multiple times, memorize it...
Charge using the LOW Side and go slow or you may freeze the line or clog the accum suction port inside.
Be sure to flush it very, very thoroughly..
The orifce tube goes on the evaporatoe smaller line.
It controls the flow and converts the liquid to gas in the system. Some say that ford blue one works wonders on converted systems.
its a red one for a 95 f150
You can get cheap gauges and a vacuum pump at harbor freight for less than someone will charge you to do it and you'll have the satisfaction of knowing the process.
The receiver dryer should always be replaced when doing this. They're cheap and if you paint it the correct black it will be just like stock.