Transmission gear indicator - Switching & programming advice requested

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i [somewhat] installed short-ratio transmission in vehicle and, after 11 years of ownership, find myself forgetting gear i'm in. (i.e., going upshift when i'm in 5th, not knowing if i'm in 3rd or 4th without looking/touching shift knob position) in order minimize distractions , keep eyes on road decided build gear indicator.

there few indicators on market, they're either big/bulky, expensive, or designed sequential transmissions.

i'm using arduino uno base. indicator adafruit 16-segment display. issue lies in switching device. unimaginative idea utilize 4 lever-style micro switches, arranged in square around shift lever underneath shift boot. allow shift lever depress 1-2 switches @ time, providing input arduino, determine gear display. indicator display "n" when lever in neutral , no switches depressed.

it suggested colleague use engine speed , vehicle speed, , determine ratio each gear. ratio can used arduino determine chosen gear. suppose reverse , neutral position switches in transmission used inputs, if necessary. arduino uno have ability process vss & rpm inputs determine ratio? if so, formula utilize this?

if can vss , rpm data arduino can calculate ratio between them.

could mount micro-switches give reliable indication , not broken exuberant gear shifts?

i think prefer sort of non-contact optical detectors.

if switches or detectors work program simpler 1 getting , using rpm data.

...r


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