The VP-200 already has the capability to show a stuck starter.  They have an input that goes on the starter side of the starter contactor that lights an annunciator when the starter is powered.  I made mine a red background with white lettering.  If this annunciator remains lit after releasing the start soft key, then your contactor is stuck closed.  Just showing power to the contactor coil doesn’t solve the problem, as you need to monitor the line going to the starter, not the coil power.   You should find the configuration settings in the Annunciator page (assuming the wire to the starter is installed on your plane).

That is a great idea, Paul.  I have the VP-200, so I can see the current draw and I can see the starter circuit energized on the screen, but that would show green for "on" in the VP world.  I much rather have a light as you suggest.  I shudder at the thought of embarking on a long flight under the condition I had.  Should be pretty easy to do.

The experiment continues!!

Gordon