I am using the GPS for speed and feel like my tach is accurate.
Keep in mind that I had my trim all the way down, and the tabs were down some also. I did not trim it out to get to the top speed, I will though and post those numbers after I do.
I was on here looking for tips on trimming and tabbing to get to top speed safely so we're getting a little ahead for where I am currently.
I will say that I'm very excited to have so many people giving advice and helping me learn as I go.