I was up in Toronto for a few days and was able to personally meet
@Menace. Really nice guy BTW. Anyways, I purchased two units and today had the chance to add them to my TZ and TAF. My TZ was the problem child. I had installed ezSBC 5V and 12V switching regulators on the power driver board and ever since it would make a horrendous noise when switched off. It literally sounded like a whoopee cushion passing gas, way worse and much louder than the normal popping sound. Loud, annoying, and it lasted for about 5 seconds. Non-pinball friends would ask what was wrong with the TZ? It wasn't damaging to the pin, just darn annoying.
Fast forward to today, no sound at switch off whatsoever, except for the click of the on/off switch. Both the TZ and TAF simply turn off, no farts or pops. Installation was a breeze. I'm thinking there's still enough clearance to remove the power driver if needed but if not you can simply unplug the De-Squelch-Inator.
If the shut-off pop noise bothers you then this is the solution. If you've installed ezSBC's regulators (
https://www.ezsbc.com/index.php/psu5.html and
https://www.ezsbc.com/index.php/psu3-12.html) then the De-Squelch-Inator is a must have.