I mounted the control module below the fuse panel on the driver's side inner cowl panel. I will get a picture at some point.
I was not really focused on the maximum speedometer number but I doubt that 80, 120, or 160 would ever be tested, at least not by me.
I know that the Dakota Digital option was taking the easy way (not the cheap way) out compared to converting the original speedometer to GPS, and reconfiguring the other gauges but I like the addition of the tach and the integrated look for the other gauges.
Unfortunately it will be a while (maybe 6 months or more) before I can actually test the gauges.