2008 Evinrude 225 exec ho tach problem

[froglegs]

Hey guys I have a 2008 Evinrude 225 etec ho and the tach needle is jumping around was wondering what I need to check or is the tach just bad.....any help would be greatly appreciated...thanks in advance

[ChampioNman]

First thing I'd do is take a small screwdriver and give the pole select switch a few turns back and forth. Then return it to the original setting and see if that helps. May just be a bit of corrosion on the contacts. If that doesn't get it you'll have to have it compared to the results of a computer running EVdiags. That way you'll know for sure.

[froglegs]

If I hooked it to my Humminbird unit with the names would that show accurate

[froglegs]

Nema

[ChampioNman]

That should work.

[froglegs]

So is the tach on this engine worked by the computer or regulator like the older ones ...not sure that regulator is right....but if someone could tell me how it works I would appreciate it....

[ChampioNman]

Runs off the EMM.

[froglegs]

Thanks everyone....

[dodgeman9]

Mine jumped up about 400 Rpm over where is usually is. Trimed out and WAO I have always
run at about 5600 max. I don’t think I could make it go over that. Today I looked at it
and it was showing 6000. 2005 Etec200ho. Never felt the limiter. Could it be the same fix?

[mactlman]

Mine jumped up about 400 Rpm over where is usually is. Trimed out and WAO I have always
run at about 5600 max. I don’t think I could make it go over that. Today I looked at it
and it was showing 6000. 2005 Etec200ho. Never felt the limiter. Could it be the same fix?

redline might be 6200k??

[Bassmeister]

My dfi was doing the erratic tach thing, I found a loose wire on the back of the tach.