A/C Compressor Won't Kick On

Is the system vacuumed down? If not that needs to be done. Check for vac loss to see if you have a leak.

AC wise the typical thing is to jump wire the pressure switch plug. This will kick the compressor clutch in. Alternatively if the compressor has a plug on the wiring close to it you can unplug it and jumper a hot wire to it to get the clutch to kick in. Not a permanent thing. Just to get a bit of the 134 in. The system should, once hooked up normally, start cycling the clutch in and out as you continue to fill with eventually staying pretty much on.

Watch your gauges! Be sure to follow the instructions on the gauge readings precisely. Will tell you if there is a blockage etc. and also make sure that you don't have a pressure issue. Too much is just as bad as too little in the system.