I have a resurrected 81 GL1100 finally have it up and running have put the first 200 miles on it. The speedometer took a dump started bouncing around and then stopped at Zero not even driving the odometer. Cable is good, drove speedometer with a drill and nothing happens. Is there a way to resurrect these. The other question is can I use a speedometer off of say a 750 will they work. Flee bay currently only has 2 speedometers listed for GL1100 and the asking price is way high.