First thing is to check to see if your motorcycle has an Automotive MMU package. If it does, your already ahead of the game.
Next, does your bike have a ECU? If it does great.
Hobby type MMU will not generate the scale or readings that a Automotive MMU will. I'd would not even frack around with hobby type MMU's for the project as described.
If you got a MMU and a ECU, with a ODBII port, the project will be a lot simpler. Just get a module that will plug into the ODBII port. I use FreeMantics with the 90 degree plug. The Freemantics does all the work of interfacing to the ECU. I then write a program to get at the data I want and to display that data on screen.
Unlike mechanics, the fellows at the parts place are quite willing to give up the 'secret codes', just visit them when they are not busy.
If your bike does not have a automotive grade MMU (IMU) then those fellows at the parts place can get you one.