Correction to my last post. Gain constant (Ap) is a calculated value. Integrator time constant is the one that could be usefully varied with engine speed.

Thank you Don for your reply. I have studied the video and all the documentation. I have also found some other videos on YouTube that solder Arduino header pins. Whilst this is not my first use of Arduino, having implemented previously a fuel pressure and fuel temperature gauge, I still feel that so...

Hi Folks, I'm a bit of a newbie to this, however it does seem that a tach input and rpm scaling would be very useful. So given that the Shield masks or even plugs into the headers (not sure) what soldering is required, could anyone elaborate? thanks.