Oil pressure warning light issue '05 R53

[NotBenny]

Recently bought an R53 MCS and generally I'm happy with it. Today I checked the oil and found the dip stick is on its last legs (no problem, cheap and easy to fix) but this made me realise I didn't think I'd seen the oil pressure warning light come on when I switch on the ignition, checked it, and it doesn't. All the other dash lights work fine (switch on when ignition is switched on then go off either after a short period of time or in the case of engine management light and battery light when engine is started) but oil pressure warning doesn't come on.

So where should I start?

[E-bmw]

Dismantle dash & check for electricians tape/missing bulb etc where it should be, one thing you DO NOT DO is run it until you know why.

[NotBenny]

Been doing some more googling and YouTubing since posting and it looks like a sealed unit in which bulbs can fail. replacement unit can be picked up second hand cheaply enough it would seem

[NotBenny]

for completeness the issue was the oil pressure switch - it was always reporting sufficient oil pressure! No issues with the dash