B737 Chronometer

Another self-designed and printed Gauge for the B737 Homecockpit....: Fully functioning Chronometer with LED. Use 28BYJ-48 stepper motor for the needle, max7219 LED PCB for the LED Displays and micro-pushbuttons (6x6 mm) for the buttons. Connect it to FSX with Arduino and the great Mobiflight software. However, I dont know the PMDG 737 offset for the Timer-seconds.... if anybody could help...?