The software is in a previous comment.
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Just a quick one - your Nano schematic shows +5V power coming out to sensors etc from pin 28 - which is actually a Reset and 5V out is from the adjacent pin 27 (as actually indicated on your diagram - but not 'connected').
Here's a quick one:
Attachment 45599
Impressive. Does it read electrical pulses from the ignition of does it read some kind of mechanical or magnetic input? I'm asking because I have a 1967 John Deer backhoe with no tach and, since it's a diesel, no electrical pulses to read. This maybe would fit the bill.
The only post I see are yours and mine. Que pasa?
Count me in for those plans! The speedo in my '96 Mustang Cobra is flaky, so after I do a bunch of other work on it I'll tackle that.
Tony, did you post a link for the code? I have been trying to understand how to use a stepper for a indicator, with out any success.
Ralph