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    New digital tachometer on ‘78 Evinrude 85HP not working correctly

    Here’s a short video I shot today of the tach: http://www.youtube.com/shorts/vuLb4PP_jj4
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    New digital tachometer on ‘78 Evinrude 85HP not working correctly

    It was stable at idle 90% of the time - definitely still an issue. I have a 500k pot laying around that I may put in series with the signal wire. Though it’s 500k I think it has a fine-enough adjustment that I can get relatively precise readings in the lower range. I’ll hook it up in series with...
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    New digital tachometer on ‘78 Evinrude 85HP not working correctly

    Changing the setting to 12 seems to have done the trick....mostly. The tachometer now reads approx. 650 RPM at idle. Once, the needle quickly climbed to 6000 RPM while engine was idling, hovered there for a few seconds, then dropped back down. A couple other times while idling the needle...
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    New digital tachometer on ‘78 Evinrude 85HP not working correctly

    Thanks for the suggestions. I’ll first try setting the tach to the 12 pole setting and if that doesn’t do the trick I’ll wire a pot in series with the gray signal wire, if I have one that’s around 20k (found 500k and 1m but may have others hiding around - I do have many different resistors that...
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    New digital tachometer on ‘78 Evinrude 85HP not working correctly

    Have a 1978 Evinrude 85HP (model 85899C) that I’ve been working on. Runs like a new engine, however I can’t get the tachometer to work correctly. The boat (1978 Ray Craft V150) originally had an Aqua Meter two-wire tachometer which was in disrepair (physically broken). Replaced it with a...
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    73 Sea Ray restoration

    Great work so far - I’ll be tuned in to see the progress and one fine boat when it’s done! I love projects and wish I had the time for one such as this...
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