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Tach Question

airchairmen

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Question again on 84 Formula T

Question again on 84 Formula Tach. Is there no positive at all to it? Back of tach has gray wire to sender terminal which goes back to coil terminal(gray wire) and a negative terminal to ground. When I check with a meter I have continuity from the sender terminal back to the coil terminal(gray wire) and I also have continuity from the coil terminal to the negative terminal at tach. Is this right?
Also putting a 21" pitch S.S. prop on vs. 19" which is on. The 21" prop will not clear my anode tab. Is there a tab made for Alpha 1 outdrives that will allow the 21" prop or do I have to run without one?
Thanks.
Rick
 
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