This is a basic ash tray insert model for an R34 Skyline. You can modify it to fit whatever you might want to fit there. Gauges, snacks, lap timer, etc.

Full disclosure, I haven't actually tried this latest version. I used the previous version in my car and it took quite a bit of sanding, so I made a some adjustments and that's what this one is.

If you try this one, be careful of the two plastic runners on the shifter surround, if this doesn't line up right, don't force it as they can break.