Do you have the wiring diagram for the 41? If not, let me know and I'll send you a PDF copy of it. What I see is the G terminal on the tach goes to pin 12 on the wiring harness and ends there. There is nothing connected to pin 12 on the engine end of the harness.
From the Flosan book• Engine Alternators: Connect the FloScan tachometers Yellow signal wire to the alternators’ tachometer output terminal. This terminal is usually marked as TACH, or SIG. Connect the VIOLET wire to a Ground Buss, or Battery Minus.
You should be able to land the yellow on the W terminal of the tach to pick up the signal.
See page 24 for the calibration http://floscan.com/html/Manuals/7500_75000_MFI.pdf
Tach that come off of an alternator are never very accurate. If you want accuracy, install a magnetic pick up on the engine and wire the yellow and violent to it. The 40 engines use a mag pick up not the alternator to drive the tach.
Go to this link and look at part #22 http://www.marinepartseurope.com/en/...0-21-1676.aspx My bet is your engine has a plug in tach sender hole, if there is a hole. Some of the 41s have a spot for the sender some don't.
Mike
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