My 20 year old Walker Airseps are spent and I am leaning towards replacing them with the Seaboard Marine EnviroVent System. However, with that system the preferred breather port connection is on the front timing cover. However, in that location is a tachometer made by Aetna Engineering, model 8901 (see pic below). My understanding is that this tach is used as the input to the synchronizer gauge at the helm, which I never use.

So my question: has anyone else ever removed this tach, and if so, can you confirm that it is the one that feeds the synchronizer? I know there is another tach on the transmission bell housing that I am pretty certain is the one that feeds the main tachometers, so those should not be impacted.

I would just disconnect it and fire up the engines to test it myself, but we are on the hard right now doing a bottom job, compounding/polishing the hull, aftercooler/HX cleaning and other misc projects. As such, starting the engines is not an option.

Thanks in advance for any help!
Kyle