I just called another dealer and gave them my VIN.
They verified that I need Product Update# 06-013 for the Tachometer Gauge Control Module.
It is dated 3-24-2006.

Honda does not call it a recall because it is not related to safety.
And it's not just a software update since they have to actually install new parts.
My dealers don't have the parts in yet; they are scheduled to arrive next week.

Actually, I think I'll wait a month so my HCH2 is not their first ginea pig.
But it is nice to know a fix is on the way.

Need fewer troops to support.
Drive a hybrid.
Best tank 71.65 MPG.

Before this car I spent two years learning hypermiling on my 2004 HCH1.