My air filter had about 10k on it so I figured it was time to change it. When I opened the hood, the little restriction gauge was pegged. I pulled the filter and it was alittle dirty but not to bad. The thing is that I can't get the gauge to reset. I have pushed the button untill I thought it would break. Does it need to be driven to reset? Not that I have a whole lot of trust in it but it should be able to be reset. Is there a trick to it that I don't know? I usualy change the filter every 10k any way.