the evacuation pump and 134a gauges are FREE for the loaning from autozone.
while youre there, i'd replace the fan/drive belt.
and you SHOULD replacethe orifice tube in the system (they tend to catch the debris
and they are critical to the balance & flow in the system)...the orifice tube is anywhere from 1.99
to 49 bucks (severe service) @ autozone.
the single alternator belt is 56 bucks.
its recommended that you flush the system (to wash any debris out)...
do NOT use water...there are special flush chemicals that should be used,
mixing the wrong fluids or oils can cause SPARKING inside the cooling system !
the a/c system Capacity without auxiliary climate control is 42.0 oz
of 134a & PAG Oil the new compressor should come w/ info that
tells you how much PAG oil is required.
if you have an auxiliary climate control (excursion rear a/c) then the
capacity is 68.0 oz
check your upper and lower coolant hoses while youre there (the lower
hose inparticular rubs against the steering control arm and can rub
a good size slit in the lower hose...even when you have the ford nylon
webbing over the hose)...ask me how i know
fwiw if you lower radiator hose is rubbed, replace it and use the old hose to
wrap around the new one for some added "rub" protection. -->