Change Oil light bulb in cluster

The oil light in my cluster has stopped working.  I hope its the bulb as everything else still works.

Has anyone changed a bulb in the cluster that can offer any advise/guidence? - I’ve had the cluster apart but I can’t even see how to access them!

Will this assist? 

https://vwgolfmk1.org.uk/forum/index.php?page=topicview&id=electrical-faq_2%2Fhelp-main-beam_2

The main beam bulb just pulled out when I did mine. 

Not all the bulbs in the dash are incandescent.  Some are Diodes  Back in the Day, they only made LED's in certain colors technology limits of the age at that time.  
VW had a thing about using incandescent bulbs and placing a colored cap over them.

Not all the bulbs in the dash are incandescent.  Some are Diodes  Back in the Day, they only made LED's in certain colors technology limits of the age at that time.  
VW had a thing about using incandescent bulbs and placing a colored cap over them.

Make sure that if you have a LED Observe the Polarity, the flat side is Negative.