Embedded: Tach… Fail?

So I’ve been using the aforementioned tach input for my pneumatic gearshift system with moderate success. However a problem has arisen.

I run a spark cut on upshifts so you can keep the throttle planted and just hit the paddle to get the next gear. This is all well and good but I also need a tach signal during this period to ensure the clutch comes up once the engine speed is correctly synced with the road speed; otherwise you get a massive jolt through the drive train and break differential housings (I’ve broken two!). The target RPM is based on the engine RPM when the shift is requested, the current gear ratio and the target gear ratio; simple.… Read More