Finally got the GG/Acewell speedo set up. The Acewell pinout document shows that it had to run on DC so I had to get 12v DC on the bike. Bought a TrailTech rectifier/voltage regular (7003-RR150 ) and capacitor (040-CAP56) and a 10 amp fuse. By the way, if I were doing this again I'd get the smaller capacitor (040-CAP27). The CAP56 is HUGE. I got AC from the white coil wire I found taped up in front of the tank. The yellow lighting coil wire that would run the lights (if it had them) on the bike was left untouched. Everything works great. The capacitor even runs the speedo for about 5 minutes after shut down, letting you do set up with the engine off. The Acewell requires an external 9v battery for the clock so I also wired that up.
The speedo provides MPH, RPM, trip 1 odometer, trip 2 odometer, odometer, max RPM, max MPH, average MPH, clock, total time, run time, shift light.
Mounted on rubber with nylon bolts. Red circle is tach pickup.
Made a wire loom with 4 positive and 4 negative terminals. May want to run a GPS.
Finished install. Note 9v battery upper right.