I was thinking of putting the screen on the dash between the speedo and tacho, which would be too small for a 2x16, and having the iduino somewhere else. Hopefully there wouldn't be lag problems with having them a foot or two apart? I was also thinking of putting the switches in another part of the dash, but discreets like that won't have lag trouble.
Also having single line sized readouts would fit the style of the existing instruments (trip meter/odometer and clock
), too.