Few steps forward:
Now that I know about the "/" property browser, I think I can confirmt that electricity is supplied to the KCS55:
"/systems/electrical/outputs" shows "hsi = '14' (double)", so basically this is different from zero.
...but still, the instrument itsef does not work. So, I took a look at both the Seneca, and my modified Velocity.
SIMILARITIES
-"instrumentation/kcs55/kg102" shows (among other thins) "input-power-node = 'systems/electrical/outputs/hsi' (
unspecified)"
"unspecified", but it works perfectly on the Seneca.
-the 2D panel Directionl Gyro Heading Bug is indepenent/disconnected/unrelated to the one in the KCS55
DIFFERENCES
*Seneca II original installation*
-Prop. Browser (/instrimentation/kcs55) shows 4 sub components: ka51 + kg102 + ki525 +
kmt112-If Master is ON, hsi aligns with magnetic compass (and, obviously, the 2D panel Directional Gyro)
-If Insrument Lighs switch is ON, hsi glows a nice orange color at night (together with all the other dials, etc.)
-the 2D panel NAV1 CDI is CONNECTED to the one in the KCS55 (you turn one, the other one follows)
*Velocity XL-RG custom installation*
-Prop. Browser (/instrimentation/kcs55) shows only 3 sub components: ka51 + kg102 + ki525
-Even if Master is ON, hsi does NOT align with magnetic compass (neither, obviously, with the 2D panel Directional Gyro)
-Even if Insrument Lighs switch is ON, hsi stays dark at night (all the other dials, etc. are lit up)
-the 2D panel NAV1 CDI is indepenent/disconnected/unrelated to the one in the KCS55 (you turn one, the other one does NOT move)
I wish there was an "All-inclusive Guide to coding FG", so I wouldn't have to bother you guys with so many details...