How do I follow an ILS glideslope on the ADI in Falcon BMS?
The trick to flying a raw-data ILS is to find the pitch attitude that gives you the descent rate that achieves the target glide slope as far out as possible, then hold the attitude as you monitor the ADI, making small attitude changes and waiting for the result when corrections are required.

So try this procedure:


As the ADI comes alive in level flight, gradually lower the nose as the indicator approaches the middle index to an attitude that is giving about 6-700 fpm down The required descent rate depends on ground speed - a shallow glide slope like that going 130-140 kt will be somewhere around that descent rate; finding it by trial and error is easy enough (a normal 3 degree glideslope, which you are probably really referring to, will need about 750-800 fpm going that speed).  Note the pitch attitude in degrees and hold the attitude. 
Monitor the ADI.  You want it to be very slowly creeping toward the target. If it stops above the target index or starts rising, you are descending a bit too fast.  Raise the nose 1 degree on the pitch index, hold the new attitude and wait. Vice versa if the opposite problem.  If it keeps moving the wrong way, change the pitch another degree and wait.
When the ADI is on the target, pitch a degree to stop it from moving, and wait.
At some point with these little tweaks you will find yourself on slope with the ADI not moving.  Note the pitch attitude and concentrate on holding that pitch attitude.
If the ADI starts to drift up or down, same deal, pitch up or down one degree and wait. If that's not enough, pitch another degree and wait.  And so on.  The key thing is to keep the corrections small and be patient.


As you get farther down the ILS the sensitivity goes up and the deviations become harder to track so it becomes critical to get sorted out as far out as possible and have the pitch attitude nailed as you get close in.  If you have the pitch angle and hold it the slope will generally take care of itself unless you encounter a change in wind that affects your ground speed.

The other thing is trim trim trim.  When you are on-target and on-speed, trim to hands off. Now only slight pressures are required to make corrections, and the "default" or relaxed, control input is the nominal correct one.