It can datalog, it has 3 inputs for datalogging. Its primitive as in no graphic display but it gets the job done. If you look at the first pic in my post you'll see at the bottom middle of the board it says Datalog with 3 tiny holes. You solder 1 wire for each hole, I believe the one with the number 1 to the left of it is for RPM.
I'll be more than glad to still do the assembly even if we dont get enough people.