I know there are others more intricate designs that are true IRS and I have pictures but couldn't find them, on the top of my head that was the first thread that came to mind. I'll try to dig out those pictures.
I'm using a 1954 Ford Speedometer in this car, thought it would look cool being that it's center steer. Since I'm using the short torque tube, I converted the speedometer to a tachometer. I bought a OER Pontiac hood tach, took it apart and installed it in the speedometer housing. The bubble was in poor shape so I made a new one in my oven. I painted it with so candy to tint the bubble. Finally, I made a new lens for it that is correct for the tach.
Is that a Banjo mounted backward, maybe turned into a quick change and turned IRS with inboard discs? I surely would love to see pictures of the set up.