I must abmit its happened to me a few years back the company I worked for did not install a green light and a blue light on the instrument panel for the selection. At the time it seemed like a small issue but looking back could have been quite a different story , lucky I was visual for most of the approach but thinking back on it that night It thought it could have turned out much worse. Reason being I was tracking in via the GPS enroute then started the approach lucky for me it was an ILS and I changed my intrest to the VOR/DME. learnt a lesson from that.