Help! Tach problems

[RABBITFISH]

I am at a loss, I have been searching all over the internet and the forums and have not found an answer to my problem. I was hoping someone would recognize this and give me a lead as to how to trouble shoot it. Here is my dilemma, 2001 Yamaha 225 OX66. The digital tach is not functioning correctly. When I turn on the key, it does not go to zero, but hesitates, then a faint 1 comes up, while running the segments seem to jump all around without giving any clear numbers. The motor seems to run fine without any problems. I have checked all of the under dash connections, all seems to be good and read the proper 12 volts when ignition is on. Tried running a different ground to it but it made no difference in the problem. The gauge works for the trim signal and the oil level indicator, and the back-light works correctly. Any ideas on where to look next? I suspect perhaps somewhere under the cover of the motor but not sure exactly where to look. Any thoughts would help. It has been working fine for the entire time I have had this motor. The only work I have done lately was to change out the low pressure fuel pumps. Maybe I loosened a connection somewhere?