3 figure out the interface required to interface with my tachometer signal or a single spark plug impulse (manual transmission, so I definitely don't want a speedometer connection!)4 write or obtain arduino software to recognize current frequency of tachometer impulses.
Wouldnt you want to find vehicle speed instead of engine rpm?
To the correspondent who suggested road speed instead of engine speed -- it's simpler and safer to have one interface that works, and by checking engine speed the only way to go wrong is if the idiot behind the wheel isn't in the gear used when establishing the initial 'speed'.
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