Is there a way with the Defi-Link stuff to disable low oil pressure warnings when ignition is off?

Don't want to turn them off entirely.

 

Doubt it, the gauge is designed that way. It won't know the difference between "engine running" and "ignition on". Just have to deal with it.

 

According the the DEFI instruction manual... No.

 

I hear your pain... no pun intended. Fortunately I mounted the control unit in the glove box so when the alarm goes off it is somewhat subdued. This location actually works really well as it is surprisingly easy to reach for the driver and yet it removes no functionality from the glove box and keeps it out of sight when you don’t need it -- which is 99% of the time.