Mxsmanic wrote in
:

Dudley Henriques writes:

We had a Cessna 337 on our line for charter use at one time. It had a
sync gauge. Strangely enough, whenever I had occasion to fly this
bird I always ended up syncing the props by ear. You could easily
feel if one of them was out even by a small amount of RPM.

Logically the smallest differences would also be the most annoying,
since they would result in such slow variations

You're an idiot.

Bertie