Sorry for the delay, my home internet connection was down last night when I was ready to respond.
What the M1 is expecting is a frequency. Assuming the wheel circumference in your M1 Package is correct (1.940 meters both front and rear), then to convert from km/h to rev/s we would first multiply by 1000 (meters/km) to get meters, then divide by 3600 (sec/hour) and by the circumference to get revolutions. So
SpeedRevPerSec(Rev/sec) = SpeedKmPerHour (km/h) * 1000 / (3600 * 1.94) or just SpeedKm * 0.14318442. Now according to the help in M1 Tune for "Sensor Scale", it says the CAN values are expected to be in mHz (milliHertz), so to convert this we multiply by 1000. Giving us SpeedmHz = SpeedKmPerHour * 143.18.
So in your Aim RS2, CAN Output, you change the output channels to multiply by 143.18 as shown below
In M1 Tune, I believe the Scale should now be 1.0, but you can change it as needed (have no data but there is data on the bus, then multiply by 10, 100 or 1000). Here is where I would start with M1 Tune on your package:
Give that a try and see what happens.