Learjet 35A - Tachometer number update

Hello,

I wonder how can i update the tachometer number to my real recorded flight hours with the aircraft.  I ask because, ive flown about 354 hours so far, but since last instalation it reads like only 100 hours.

I know, i know, its one of those "nice to have", but what the heck, its all about simulation, right? Itll be excellent if i could update to my real recorded flight log to compare and other math things.. :wink:

Thanks...