Very common for your knob to break off, i don't think there is a replacement as the unit is supposed to be sealed shut.
How i did mine (open it up) i used a mini gas blowtorch to heat my Stanley knife & slowly melted through on a 45 degree angle (important) if you try & just lever it open all you end up doing is deforming & cracking the outer case it is well & truly glued from factory not to come apart.
Once you have made up a new knob & fitted it (making sure it will pass through the hole) Araldite the cover back on & spray it black.
I did the same with he tacho as the window had gotten all misty with dust.
Mezo.
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