Ok, I am still investigating the Speedo. I calibrated it and now it goes to 200mph stays there a while, then bounces back to 0, then goes back to 200, but it mostly stays at 200. It does all this regardless of if I am moving or sitting still. Speedhut gave me a few things to try, so I have to get through their list first, then call them if it still doesn’t work.
That's what my OEM speedo was doing along with bucking as I got on it.
That connector to the airbag-crash module being loose seemed to be causing it. The red locking tab was broken...I dabbed a bit of permatex on it to keep it in place.