Nonsense. There's a high-pressure switch and a low-pressure switch on the lines, and you're getting borked by the latter.
It is very important to understand that the coils for the compressor are exposed to the refrigerant/oil, and that they're running 400v. You must use a very specific oil or else you'll poison the whole system and the compressor will develop carbon trails. You can not use a gauge set if it has -ever- been used in a normal mineral-oil system. Even a drop will poison your system. (Don't ask me how I know) A poisoned system is recoverable (I did it), but you don't want to even get close.
You don't say whether the replaced condenser was new or used; if used don't worry about adding oil. If new, pay Tesla for the right oil. Two capfuls, under the circumstances.
The desiccant bag is in the right (supercool) condenser, in a vertical manifold. There's a screw cap on the bottom. You can save a couple bucks on eBat, but just buy one from Tesla.
Rent an A/C vacuum pump and pull that system down for at least an hour. There must not be a molecule of air or water in the system. Then carefully put in the right weight of refrigerant, purging the gauge lines before letting it into the system.
Air suspension, is the compressor coming on? If not, fuse? See, this is where you need to be rooted, so you can actually see the errors.
Radar, It must be pointing absolutely straight ahead. First make sure the car is on a level surface and you've fixed the suspension, and that the radar is firmly mounted. Then put a block on its front surface, and on that a square. Not a cheap one but something quality like a tri-square or even a large framing square. Draw a taught string out from that at least 10'. There's an azimuth and altitude screw; adjust those until absolutely straight forward.
