Long story short....... Is there any place that I can tap into on my 525 to run an analog rpm signal to my analog tach? I'm aware of the new wiring harnesses and AGI box and ECU reflash. I'm looking for an easier way to do this. Where do you connect a test tach on the 525? I may be able to use that point. It has to be before the ECU where all signals are converted to digital.

All mercury harness have a extra wire in the back for tach output. Typically its gray and is a bullet connector.

I will look for that tomorrow. The boat is here in the garage. That is an analog signal? Is it for test purposes?

Did you find it? and did it work?

It's still been cold in Michigan. I've done some work on the boat but the garage isn't heated so haven't done much. I did not look for that wire yet. I will though and will post pics when I think I may have found it.