BF225 Tacho reading high and trim guage too low 😫

[metal-chicken]

Took my 2007 225 out today to check it out after some very wet and windy weather recently.
The engine ran OK but I noticed that the taco was reading about a thousand revs too high when running and when the engine was off it went down to 1000 until I turn the ignition back on and then it would drop back down to zero.

As soon as the engine started though, it was reading too high again.

The second thing I have noticed is that the tilt trim gauge is reading too low.

I had a quick wiggle of the wires behind the gauge and it seemed to change something. Could these issues be caused by a bad earth for maybe some moisture has got into the loom connection at the engine ...... or are they probably unrelated?

 

[jgmo]

MC,

Well...

Two dash mounted items "acting up"
And....

"Something changed" when wiggling the wires....

I'd say you might be on to something with that bad ground idea.

Keep wiggling!

Or, you might try adding a temporary, verified ground to both and see what happens.

Load testing the wires using a 12 volt lamp AND wiggling at the same time also works well for pinpointing connection faults.

Just tossing out some ideas.