I apologize in advance for sounding dense, but I must be missing something. Apparently you have a layout with Fastrack switches. In your initial post you link to a thread which discusses the so-called "yellow wire" which is an output signal from a Fastrack switch which can be used to determine the thru vs. divert position of the switch. As you show in your youtube video the Fastrack switch is a "modern" design with LEDs, diodes, etc. The Marx switch is an "old-school" design; it does not offer that same "yellow wire" output signal.
Question 1. So are you asking how to create this "yellow wire" signal from a Marx switch?
Question 2. Apparently the Marx switch is a one-off (all your other switches are Fastrack) and it's for use on a bench. If on a bench why is it important to have an indicator of which direction the switch is thrown? Seems to me if it's on a bench for testing purposes, aren't you're staring right at the switch so why the need for a direction indicator?
Question 3. You say your have an MTH 3-aspect signal head and you even show it in your video. I don't understand how a Red-Yellow-Green signal head, not to mention one with MTH's integral yellow-to-green timer, relates to your original requirement for a thru vs. diverge 2-aspect indicator. Do you use or plan to use a 3-aspect signal head to indicate switch direction on your layout?
