What A/F gauge do you have? If it's an Innovate my design would probably fit it no problem. I have since redesigned (but not reprinted) to put the ambient light sensor to the right of the A/F gauge as its current location makes it a little challenging to get the left hood mount bolt tightened. The picture is of my current model and the 3d model is the redesign that I will print and test soon.
The two holes in the bottom are for the steering column mount bolts. I want to say they were 3/8" thread but I don't remember the length aside from my replacements being 1/4" longer. The body is printed with solid 1/4" thick material at the bottom of the mounting points so I was comfortable cranking down with the mount bolts. They haven't backed out at all and they're still solid and tight. There's clearance around the mount points that fits my 3/8" socket and thru holes at the top that allow an extension from my ratchet to reach the socket.
The design is 3 pieces. There's the main body and two inserts for the gauge mounts. They're dimensioned for the stock boost gauge and the AEM A/F gauge. They allow for clocking of the gauges and (fairly) easy replacement of the gauges if they have different mounting depths or stud locations.
I'm not comfortable sending you one without having tested it first, but I'll be testing this soon. If you have a different A/F gauge, I can either post native files, or you could probably snag a few measurements and I can adjust the insert pieces to fit your gauges. We can round up the cost of shipping to the nearest $5 or whatever works for you.
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