The LS wheel isn't a problem, the snowflake front wheel with dual discs, is a little tighter, and the oilhead, is impossible to get to, and looking at the 650 Guzzi, it's going to be problematic as well .
I had a digital gauge from NAPA auto parts, bought it in 2002, after I got the oilhead, it had a round gauge, like the 'analog' type, with a foot long hose with a pressure bleeder valve, it worked great, until the 'ribbon cable' from the pressure transducer to the LCD developed broken wires at the pc board, I repaired these solder joints about 10 times, and then couldn't repair it anymore, from what I can tell, this is a common problem with these type gauges .