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Wow; some thread drift here! And - lots of useful info!
Anyway, I picked up a speedometer module at a local scrapyard for $10. Got it home, wired it up on the bench with a function generator and a power supply - looks like it works good! Smooth speed readings across the whole spectrum.
just out of curiosity, what does the old module do hooked up to the sig-gen?
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.