Luggage compartment lighting???

Hello, since this is my first posting here, I want to introduce myself briefly: My name is Thomas, I am from Berlin driving a Jetta II, BJ. 91, 1,3l. So far I have only changed the instrument lighting to blue. I want to retrofit a trunk lighting in my Jetta. In the evening something to look for in the trunk is really annoying without light… I already have the switch, also the cold light cathode tube. Where can I get the electricity most easily? somewhere already a cable for the lighting? Best regards Thomas