Air compressor help

[KMC3420]

I have an 80 gallon eaton comprssor. Bought off craigslist. Didn't know til I got it home it's 3 phase. I am in the process of converting the starter box on it to single phase. Already purchased a 5 horse single phase motor. Any body done this before in regards to the starter box. I have been told to jump one wire inside the starter box to convert it to a single phase box. Just don't want to mess this thing up. Here is a picture of inside the box.