I don't know why on earth you would want one; any vehicle I've ever ridden or driven tells you pretty clearly when it wants a different gear. The Stryker is no exception.
I did find this: http://www.electronics-lab.com/projects/automotive/006/index.html
Seems like a pretty cool project, if you're into that sort of thing.
http://www.nicecycle.com/LED-MOTORCYCLE-GEAR-SHIFT-INDICATOR-p/shift-indicator.htm
One already made up for $50, I guess. They're out there.
I did find this: http://www.electronics-lab.com/projects/automotive/006/index.html
Seems like a pretty cool project, if you're into that sort of thing.
http://www.nicecycle.com/LED-MOTORCYCLE-GEAR-SHIFT-INDICATOR-p/shift-indicator.htm
One already made up for $50, I guess. They're out there.