Doing A/C repair are manifold gauges and vacuum needed

Harbor frieght has gauges and vacuum. I wanted to know can use just vacuum or do you need both to hookup together to do job? Manifold gauges can hookup to low port and high port right? Assuming vacuum can hookup to manifold gauges.

After changing out compressor and accumulater and flushing evaporator, condenser and tubes. Switching out orifice tube. I plan on put it all back together vacuum out moisture. Than take it to shop to have it recharged.

P.S. Forgot to make sure I change the o rings for all tubes too.

Oh yeah, I also forgot that compressor needs pag oil. I guess any viscosity will probably do since that stuff is expensive.

Well after system is evacuated and parts are switched out or repaired. Components should be flushed right? Then put back together then vacuum out then recharge right? If so, my attention is to let profession recharge back. All these places around me will not do one thing without doing another, which is too expensive. Cheaper maybe if I get me so manifold gauges for bout $50 and vacuum for bout $100 do that part by myself.

Hmm didn't know that I will con firm that.

I just called jiffy lube, they do vacuum before recharging, but for extra charge though.