Keybinds:
Press F6 for show/hide current RPM and speed
Press F5 for show/hide max power, max torque and mass(for show it you need show current RPM and speed)
Notes: for correct values of max power and max torque you need start engine and up it to operating temperature(like on screenshot)
How to install:
0. You need have Mod Loader
1. Copy SpeedPower.dll to Mod Loader mods folder
My GitHub(source)
My other mods
You need read game changelog.