indicator light

Today I went to start my TC45DA but the glow plug indicator light never came on through two separate starts. Has anyone had the indicator bulb burn out? A bulb replacement would be a simple fix and I like that idea.

My Yanmar SA425 does not not have a 4wd indicator on the dashboard. The 4wd is controlled by a lever. Up is 2wd - down is 4wd. I am thinking about using a tilt switch (mercury?) or a magnet switch. When the lever is down then the switch will complete the circuit activating the dash LED. Has...