All installed now. had to do some rewiring as the 400C draws a lot of current the wires, relay socket and fuse holder are heating up too much!
when everything was fixed, the 400C fills up my tank from 0-125psi in a little under 2 minutes 
the 400C is much louder though. need to work on lowering the noise the compressor makes.
Did you put those rubber grommets back (rubber feet)? I am glad you are happy with your new toy and I still have one waiting in my shed.
They tore in half when I took them off. the rubber was rather brittle. but I still put them back when I mounted the comp. 
One thing though. the leader hose leaks when moved. I don’t think its a bad thing. Making it an impromptu ‘unloader valve’ hahaha.
edit: I had a little problem with the sender. the first time I used it, the output was jumping. The compressor would run-stop-run intermittently. A few cycles later, it no longer did that. I also changed the on-off difference. The new sender turns off at 125psi, and turns the compressor on at 115psi. changed it to 100psi on, 125psi off. 
Pressure sender isn’t consistent!!!
Compressor stops at either 125psi or 130psi. It changes during the time of the day, position of the moon, what I’m wearing or whatever.
It may do for now but I’ll still look for a cheaper source of the original sensor. RS Philippines has the actual sensor I first used, just priced twice the sender! But when I was using that, it was always spot on!
square d ftw
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For some reason I thought the sender was for your gauge.
Now I see that it’s actually for your pressure switch.
/facepalm
Can’t blame you for that. The sender made for gauges.
darn thing now stops at 120psi. lol I need to start looking for a new pressure transducer.
Those industrial things are huge! can’t fit them under the kickpanel.
The sender is a electro-mechanical device. must have broken in now. it now stops at 130psi all the time. I did several 0-130psi cycles and it stops at the same point now.
I also rewired the power going to the comp. replaced everything with true 8ga wire. got a 60A mini ANL and fuse holder for free too! Fill time is now 1min 45sec from 0-130psi! cool!!!