Ferg & Gert,
For a 914 on the TCU plug, pin 26 & 13 are used for the tach. I wired ours to
our GRT EIS with 26 as ground (since diagram (fig 52 914 install manual) shows
26 going to the negative terminal of the tach) and 13 as signal.
On the Rotax tach, there is a + sign next to terminal 1 and a - sign next to
terminal
2, so I connected terminal 1 to +12, terminal 2 to ground & 26 of the TCU
and terminal 3 to 13 of the TCU.
For a 912 the diagram (figure 67 page 109 of 912 install manual) shows 23 to be
the plug from the tach coil (shown as #24) and either wire can go to terminal
3 of the tach, the other wire goes to terminal 2 of the tach which also is
connected
to ground. Terminal 1 of the tach connects to +12.
Hope this helps.
Jim & Heather
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