I have a KDS monitor, about 4 years old. Works well except it sometimes changes color tone. A white page may look a little yellow and changes back to looking whiter. I checked all the cables, for cuts and tightness.
I was given an old KDS monitor some time ago and it seems that they aren't the most reliable pieces of equipment. Unfortunately, you may want to get a new/newer monitor. I tried the tape thing, and it just doesn't seem to work well enough.