I was assuming it's the indicator because the 203/208 and 204/209
series have the internal reveivers, unlike some of the others that
require a separate receiver.
I was leaning towards replacing the old indicator with a KI203 so it
would match my newer Ki 204 which is the same thing with glide slope.
These have the moving bar instead of the pivoting needle.
The units have a bunch of pins in the back. I was curious if the
change over amounts to pulling out the old indicator and pushing in the
new one until the pins seat.