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Used market is your friend for air compressors. I sometimes see 80+ gallon 7.5 HP Quincy, Champion and similar industrial compressors used for good deals. Some even come with stuff like intercoolers and low oil shutdown switches.
A true 5HP is probably bare minimum for doing modest automotive finishing, although a lot of guys get by with the consumer 60 gallon that are around 3.2 HP.
Finally got my DSP5 switch in the other week and boy is this truck a completely different beast now. Super impressed with this.
I used the Longhorn Fab cigarette lighter mount to mount the switch to my center console. Really like this mount although I did have to super glue it rather than it just clipping in place. No big deal.
Also added a USB-C charging port on the right side. Haven’t used that yet so I can’t say how well it works.
Also I finally got around to claying and sealing the whole truck. It’s been parked in the garage these past couple weeks though. The city tore up the road I take to work and it’s a dust storm. Decided to drive the Silverado for a bit anyway.