You maintain the supercharger's lubrication by simply using the correct grade and amount of engine oil as specified in your owner's manual for your Bonneville SSE's engine. This involves a regular oil change using the recommended oil type (likely a synthetic blend or full synthetic) and viscosity (like 5W-30 or 10W-30, again, check your manual).
Failing to use the correct engine oil can damage both your engine and supercharger, so always consult your owner's manual for the specific recommendations.