Snazzy,

I had exactly the same problem (well, my dealer did). The dealer could not make the upgrade work, and sent the whole instrument cluster back to Honda. Honda fixed it, and returned it to my dealer... took a whole week. Considering the dash had to be disassembled, I did not want them to take it apart twice. Everything worked out ok in the end. BTW, the part that they ordered for me was a computer CD with the new program for the tachometer module on it.