I bought a 1998 sportster 1200. I need a new speedo so I bought one off ebay that was advertised as coming off of a 1997 sportster. I checked the wiring in a repair manual and it looks like it came off of a 2004 or newer bike. The guy who sold me the speedo told me that I should be able to make it work on my bike anyway if I have the right harness? Is this possible? Can I make this work or should I send this back and get a different speedo?