Need Help w/ Compressor Setup - Motor & Starter

[BMS]

Bought 3-phase compressor off a guy locally. It's an 80-gallon Speedaire with a 3-phase, 10-hp Dayton motor. I know this compressor was available in 10hp and 7hp configurations, so my thought was I could replace the 10hp 3-phase motor with a 7.5hp, 1700rpm, 1-phase motor. I can't seem to wrap my head around phase converters so I figured I'd just replace it with single phase. I only paid $200 for the compressor, so I have room to put a little $$ into it. Problem is, I am not 100% sure what I have / what I can reuse.

Pretty sure the pic of the two boxes is the motor starter and the disconnect switch. Are motor starters phase specific or should I be able to reuse it with the 7.5hp motor? I can take additional pics if needed for help.

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[rodm1]

7.5hp should work with no problem. I would just get a new starter for it. Do it right and rewire it and it will be decades before you have problems with the motor and starter.

Photo 5 is the psi shut off switch. Open the motor control and take a photo some one might be able to help you then.