Homemade (AVR) speedometer via HaD. Howie writes –

My speedo cable snapped. Boo. The speedo was never very accurate anyway, so rather than replace the cable I figured it’d be fun to try making a digital speedo – plus it’s an opportunity to try using surface mount components rather than the bigger through-hole ones I’ve used so far. A bit of an ambitious design this time round – separate display and control boards, bigger and more complicated than anything I’ve done to date