To check, you can get one of these:
http://www.aircraftspruce.com/catalo...es/trutach.php

As pointed out, can get get various 1:1 tach RPM settings.
You specify it when you buy one.

Go to http://www.gulf-coast-avionics.com/
and type "tachometer" in the search box. You'll see the
1:1 RPM listed. Maybe a number in the model number
gives it away (like the 3 or 5 at the end in the ones listed).

Paul

"John Roncallo" wrote in message
om...
Thanks, this makes sense. Is there anyway I can tell what is supposed to
be installed in this particular aircraft?