What is this light for?
 

Hello my name is Jurgen, I am working on my brother's 1966 mercury parklane breezeway. We live in Haarlem, The Netherlands.
I am new to this forum and I have 2 questions. I hope you can help me out.
1. Can you please tell me what the light on the picture is for? I'd say that it's the park brake warning light, but I can't find a switch.
2. The light won't go off. So can you tell me where the switch.
I am looking forward to your answers. Thanks for your time and effort!

Kind regards,

Jurgen
https://cimg6.ibsrv.net/gimg/www.mer...078fb6be8e.jpg