Hey guys my rpm gauge has been reading that i have been over reving when i am only going 1/4 to 1/2 throttle, No it is not over reving either, it just reads it is. Is it a bad tach by chance or is there something else I should be looking at. I just got the boat this last August. It worked fine the first couple times I took it out and now it started doing this. Thanks in advance..
make sure there are no loose connections 
Thes gauges are not totally water proof what might help is there should be a screw on the back that sets the number of cylinder etc. Notice where it is set and take that screw and turn it back and forth a few times, sometimes corrosion gets in the connections. If that does not help a new tach may be in order.
On the back of the tach there should be an adjuster for different outboard outputs (poles). Google tach settings for your engine
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