My ITI odometer gears stripped out and I can't find any way of repairing it. I would like to keep the bike somewhat saleable, which means replacing with a bike speedo won't cut it. The plan is to use VDO 80mm Speedo and Tach. The instruments should fit in the gauge cluster without too much persuasion. The trick will be to interface a hall effect drive to the bike. The first attempt will be a GM Hall effect drive available from many places. In this case eBay $20 shipped.
The first problem is to adapt the threads. The GM sender is a female 7/8-18" thread, which is very unusual. Luckily I have a lathe and a modicum of machining skill, so I will machine an adapter. The bigger problem will be fitting the sender and associated wiring beneath the throttle linkage. There is very little room as this picture shows:
When the throttle is wide open the fitting only clears the top of the sender by 1mm or so. Once I have the adapter machined I will cut down the skirt around the connector pins and solder leads directly. This will allow me to increase the clearance by 10mm which should be plenty. I will put a weather pack connector closer to the meter to allow for disconnection later.
This has been done on a different model of Guzzi, and was documented here. Luckily for him his speedo drive was further aft and only interfered with non-moving parts.