Don't want to ruffle feathers but I did wonder why coilover did not want to use the 54 self cancelling switch that 54 trucks had. I believe it was the first year for that type. They used a tab on the steering wheel to cancel. If I had a factory style switch, I would use it. It is original as it gets. Should last a long time. I sensed his frustration and joined in the quest for electronic since I visited it a year or more ago. (to be used on trucks before factory unit or trucks not ordered with this option that use a 900 style clamp on).
For Coilover, I advise using an original self cancelling unit.
In my expert Electro-Mechanical Engineering opinion
the 54-59 is a very nice factory unit. It is an enclosed module and is actuated by all metal parts. Pretty strong. Reliable. All fix-it parts available. Not difficult to get at.
The goal of using a 900 style to get true self canceling, no extra buttons, no manual turn off, at a reasonable price is not as easy as it seems. Trust me on that. I fear that Mr.Coilover will find that out after spending some money and effort.