I have a 67 FLH with a 73 shovelhead engine and 80inch top. Still has points. I just installed a speedo tach combo and got most of it working. The tack is flutering all over. I have done a tuneup (points condencer plugs and even the timing). I put my digital timing light on the bike ( both jugs) to see if it was the speedo tack combo and it looks like it is something else. Any ideas?