gunrunner has said this before guys, if he thinks its not worth the upgrade, then it isnt.
Wrong. It is up to the owner to decide if an upgrade is worth it. I also don't recall GRJ ever making such a blanket statement. I have upgraded locos over 60 years old. Economically not justified, but because they were given to me by my parents, because I don't like to see them unused, and because I want to run them under command control along with my modern MTH stuff, to me they were worth the upgrade.
GGG: I should have studied the thread and realized that the leading zeros were being omitted. Mea culpa! There was a statement in the above thread that the PS3/2 upgrade boards might not fit in some locos, and you have pointed out specific instances. This is what renewed this issue for me.
GRJ: I have to study the pinouts, but I suspect that adding a submini plug & socket set between tender and loco would enable these functions without a mux board. I have used these in converting a tiny steamer which had no room for the 10-pin socket. Personally, being able to turn on/off firebox glow or marker lights is not necessary; what I want is loco control. In fact, one of the 1991 Weaver diesels that I upgraded has a beacon atop the cab, which I left hard-wired. It flashes whenever track is powered, and I have found it a good feature. ((FYI, RF&P switchers in Potomac Yards used toll have these so tower could see where they were.)