Ian..could be a few things..
1. Brakes - was the dot 4 new when you put it in the system ? you could have a leaking seal on master cyl, drawing air in when the lever is operated. You could still have air in the system from improper bleeding, but this would show up from first pull though.
2. Tacho - sounds like a loose connection somewhere, or its on its way out. Check the cables to / from the unit visually. |