Baron 58 airspeed Gauge

If you go in the Cessna 172 FSX and take a look to the airspeed gauge,you l see a knob to move(inc/dec)a scale depending outside temp.Yo can control it by mouse click up / down ORAssingn 2 Buttons event to them using tokensIt works well in cessna 172 and money that use the same gauge.In my cockpit I use encoders to do so.But when you go in the Baron The Gauge has the same knob so you can control it with mousclick. But tokens has no effect,so I can`t assign buttons to these.For long I try to modify the Baron airspeed indicator.XMLI tried a lot of things looking at documentation and also looking to other gauge that use tokens.Without success. Plus I dont find the .XML for Cessna 172 airspeed gauge.How can we had a Btns or Key control to Gauge?At least where to start?Regards