Automatic engine smoke on Richard's 727 panel

I really like the automatic engine smoke feature on Richard Probst's new 727 panel, and I was wondering if this could be added to other aircraft.Would I be right in saying that the feature is linked to a gauge in the panel, and upon reaching 70-80% N1 it will trigger the engine smoke?If this is the case, what gauge is it? I've had a quick look through the panel.cfg and I can't find anything obvious...I really like the feature, and I'd love to add it to my HJG 707s and DC-8s.Cheers.