I want to build a digital tach for my '05 Yamaha R6. I've got the display side down, it's just the input signal I need confirmation on.
I've found that the OEM tachometer signal is a square wave, average peak voltage of 10v, but can be upto 14v at higher RPMs.
- Can I just use a resistive voltage divider to get the signal down to the 5v level?
- I was planning on just using a LM7805CT-ND to step the supply voltage down to 5v to power the Arudino.