the ECU must have pin out to make RPM meter work, just need to device a way to let is send signal to cluster.
I have been looking to get a cheaper solution for RPM in alto with Help of Hassan.
It is basically to get display on the android unit getting signal from OBD scanner thru bluetooth.
SZ does show the RPM but in numerical format, it does not support graphical display just like Torque.
so trying to find a way to let it connect to torque app to show RPM in graphical interfacw