Ignore the oil level gauge during driving.
Check the oil when the engine is properly hot, with the engine running (like when you get home after a run). Stand the car on level ground and wait - for a few mins, even five. In due course the oil level gauge needle will creep up. A good reading, ie signifying full, should be '3 o'clock'.
As a precaution, check the dipstick as well (just in case the gauge is faulty). And check the oil level frequently, like every couple of hundred miles. Oil is the lifeblood of an 'air-cooled' engine.
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