Thanks for the help. I figured it out (with a little help from the THT board) and you are correct. Purple is keyed hot but on the Tach/system check I didn't want to splice it so I used on of the bare purple wires from the other tach setup. The harness has an 8 pin plug for tach/system check and then two sets of three bare wires, one for tach and one for system check so if you didn't have a combo gauge you can use those. I grabbed one of the purple wires from them and used that, capped the others and are good to go.
For performance (now that I have a tach) I am getting average 41.5 WOT at 5400, that is trimmed and full fuel two POB. Trimmed in she maxes at 38/39 at 5100. I am swinging a 15x17 OEM SS prop. Your WOT sounds about right if you haven't trimmed her out. Now that I have a tach I will be doing some more research on what works.
-Svence
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1984 V-20 Steplift
1998 Johnson 175
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