Hi i have a 2005 Sportster XL1200C i was having intermittent issues with the stock speedo, and have since replaced it with a speedo/tach combo. Hoping it might solve the problem but more so i wanted the upgraded display. Since it is not the Speedo itself is it going to be the Speed sensor, Crank position sensor, or both. My manual suggests i can take out the speed sensor and clean off metal debris from it. Has anybody had this issue and know where i should start before i go and start buying sensors.