Calibration Knob for Speedo

I have a 03 Mobius LSV and I had recently purchased Perfect Pass for my boat and it was installed by a dealer. One problem though. They removed the calibration knob for the speedo they removed which the perfect pass display replaced. I would like to put a knob and whatever holds it in place so it doesn't look bad (hole in the intrument pannel). Does anyone know the part #'s for the knob and the part behind the knob that holds it in place. I understand it will have no function. It is for athetic purposes only. Any help would be appreciated.

That is really weird. I have an 03 Outback LSV that came with Perfect Pass from the dealer and both speedo knobs are still in place even though the one doesn't have anything to do... take it back to the dealer and make them fix it.

I have an LSV with Perfect Pass too.
The knob is there.
Larry is right... take it back and make em fix it>