A scrap of aluminum plate and five hours of milling, threading, bead blasting and clear lacquer later...
Back story: The 160 HP Yamaha EXUP I just finished installing on Geoff Resney's Air Command had developed a problem: The ASI wasn't working. I took it out, gentle pressurized it until it read 40 MPH, re-installed it, re-checked the tubes and exhaust port for blockage, still NFG when running up and down the RW.
My solution - since I needed a speed indicator like now - was to download an app to my iPhone X and make this bracket to fit where Geoff's Icom usually goes.
You like?
BTW, the app allows you set the scale to 50 MPH (shown), 100 and 200 MPH, and has a digital 1/2 screen (shown), a GPS map 1/2 screen (Shown, above) or an info 1/2 screen with junk like max speed traveled, distance, etc.