The upper helm has two tachs that are both obviously way off. The lower helm (original analog tachs) appear correct.
They upper tachs say "Ensign Digital Tachometer / Aqua Meter" by Rule Industries, which apparently no longer makes them, or even has their own web site since being taken over by ITT some years ago.
Replacing them is on my "to do" list, along with a total re-make and re-wire of the upper helm station.
Meanwhile, I'd like to see if I could fiddle with these enough to get a rough approximation of my real RPM.
I'm running twin Perkins 3.544's with the tach signal coming from the alternators.
I don't see any set screw on the back of the tachs, anybody have a manual or diagram for this, or at least a clue as to what to look for?
Thanks!
They upper tachs say "Ensign Digital Tachometer / Aqua Meter" by Rule Industries, which apparently no longer makes them, or even has their own web site since being taken over by ITT some years ago.
Replacing them is on my "to do" list, along with a total re-make and re-wire of the upper helm station.
Meanwhile, I'd like to see if I could fiddle with these enough to get a rough approximation of my real RPM.
I'm running twin Perkins 3.544's with the tach signal coming from the alternators.
I don't see any set screw on the back of the tachs, anybody have a manual or diagram for this, or at least a clue as to what to look for?
Thanks!