Hi All,
I am installing a Flo-Scan on my AD41 B.
The tach was very erratic and I had always wanted to know my optimum cruise speed so I went with the Flo-Scan. 750M-BOS-2K.
My question is what are the "W" and "G-" terminals on the back of my Volvo Tach?
I am pretty sure they are for the tach.
I connected them to the wires for the Flo-Scan and when I run the engine I get either "0" or "9999" depending on which way I connect them.
"W" to the yellow wire (from Flo-Scan) and Violet (from Flo-scan) to ground gets 9999.
G- to the yellow wire and violet to ground gets 9999.
W to the yellow wire and G- to violet wire gets 0
W to the violet and G- to yellow gets 0.
The tech person at Flo-scan says that I am probably wired correct but just need to calibrate. (with the first configuration). This is good news but then I have an extra wire (G-).
Any help is appreciated.

Thanks,

Peter