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1975 Newport 28
1986 Hunter 31
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591 Posts
Discussion Starter · #1 ·
One of my spring projects has been to move the instruments from down near the shift levers to a new instrument panel I installed on the starboard side of the cabin bulkhead out in the cockpit.

Imagine my surprise when I pulled the tach out from it's hard-to-reach location and found that it had been set on 6-cylinder instead of 4-cylinder all this time. (I have an Atomic 4 engine.) :mad:

Now I don't know a whole lot about how tachs work, but I'd think that being set on 6-cyl would give me a 50% less reading on the actual rpms. Does that sound right?
 

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That would depend on just how the tach senses the rpm... if it's picking up on the pulse to a sparkplug then you could be right. Other tachs run off the alternator or a direct flywheel pickup, and would be unaffected, but then those types would be unlikely to have a "selector" setting.
 

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928 Posts
460 cubic inches of real auxiliary power.

I leave it in the parking lot when not in use.
 
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