A lot of folks are getting a code from this speedo/tach combo.
I have it and the engine light and red light comes on several times a day. It doesn't bother me because I know it means nothing, just lights coming on. I need the tach.
There is a long thread on a different form about it.
There is a different one that has a small tach to the side that seems to work good for 06 up bikes. Mine is a 05 so I'm stuck with it.