dcb, it appears I have experienced an early failure of my lcd tonight. Bummer... right when you posted the things I needed to change with the injector tap and vss number!
My guino power led is on and the other led is blinking as normal, but the lcd is dark. Tried the reset button on the guino and disconnecting and reconnecting power to no avail.
It seems to have happened when I was reconnecting my ground wire, and bounced power a few times as I tightened the screw.
Anything I should check for before writing it off? Do you think they'll send me a replacement like they did for you?
Thanks for all your help and work on this project!