Tachometer gauge connected directly to M2

Any chance of seeing a short video of the Tacho in action on say the left hand side of the screen with the M2 Can packet read & converted before sending to the tacho displayed on the right hand side of the screen i.e. serial console.
Am interested in specifically if there is any noticeable latency in the time reading can packet decoding converting to PWM & then displayed on the Tacho.
If possible a display of processor free time while this is running. i.e. what sort of time is available to the M2 to accomplish other tasks while it is processing the can packet & converting to display on the tacho.
Regards Tony