Outboard tachometer?

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svscott
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Joined: Fri Aug 12, 2016 8:35 pm
Sailboat: MacGregor 26D

Outboard tachometer?

Post by svscott » Mon Mar 25, 2019 7:06 am

I'm planning to change out my original propeller on my 1998 Nissan nsf5a outboard with Tohatsu's " elephant ear" high thrust prop for better marina handling. I've never had any sort of tach or anything to monitor rpm, aside from my ears. I've already bolted on a 6hp Tohatsu carburetor for the somewhat inexpensive performance increase.
Can anyone recommend a low cost solution to add a tachometer? Before I swap the props, I'd like to note boat speeds and performance at particular revs.

I have found Tohatsu offers a tachometer for about $100, but that seems overly high for what it is, and I hope to find a budget oriented alternative.

Stevenhigbee
Engineer
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Joined: Tue Aug 26, 2014 8:15 am
Sailboat: MacGregor 26S

Re: Outboard tachometer?

Post by Stevenhigbee » Mon Mar 25, 2019 8:07 am

I have a little battery-powered digital unit that the sell for under $20 that wrap around a spark plug wire, and display tach and hours of operation. Easy search on Amazon or Ebay.

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Seapup
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Location: 2002 26x - Virgina Beach, Va

Re: Outboard tachometer?

Post by Seapup » Wed Mar 27, 2019 7:13 am

I have had a few, they all seem to work fine, even the cheapest $12 digital tiny tach. I like them for the hour meter. Even though they are supposed to be waterproof mine were not and ruined by rain, hence buying a few 8)

I bought one with a temp probe/alarm last time. Has a little ring that goes under the spark plug and gives a digital temp readout. Thinking was to add a high temp alarm for if the ports start to get salt restricted.

If you plan to use it as a gauge be sure to get one that is sunlight viewable. I got one of the blue led ones and it is almost impossible to read in the sun, the basic LCD version shows up fine.

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Be sure to post up the results of the RPM/Speed and impressions of the prop swap. They are pretty common little motors so would be helpful to other owners.

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