Gavin,
I also am using the mirror motor for trim. A microswitch can be placed so that
it will turn on a panel light when the trim is neutral. There might be a
problem with space to do this if you have imbedded the motor in the horizontal
stabilizer.
I've mounted my motor in the rear of the fuselage with a push-pull cable to the
trim tab. The reason is that I put limit switches on the motor, since I found
that the force developed could peel the trim tab right off. That would not be
good when on short final.
Jim Vance
[email protected]