you're right, i could have used that, but no real need for a smaller one. next project i'll consider it, i didn't realize the nano still had so many useful pins

i would not go behind the display regardless in this situation, mostly for purpose of wiring clutter

on a bike your wires mostly hang out. power/ground/speed/neutral/oil/fi/signal/temperature/etc including any transistors/diodes/relays involved is a large harness bundle.

if i hide the uno in the frame and just run external wire for the display, i could even use an old usb cord for the harness, since it only needs 4 tiny wires