It's very important to know that your VW Kombi or Beetle has oil pressure. If your oil light isn't coming on when you have your ignition on and engine off, there is a good chance you may have a faulty oil pressure switch.
These are a cheap part and easy to replace. If you are unsure, why not just swap it out so you know it's working.
This is a 1-pin oil pressure switch that will fit most, if not all, air-cooled VW's.
If you are unsure, check the part number
Part Number: 021-919-081/B