Tach worked when I started it up this spring. Finally got on the water this year. (Thanks Michigan ) and it's not working. It's the square style if that matters. 1986 242LS

any ideas on where to start?

Check the wiring on the back. Clean, Reseat all of the connections. There is a cylinder select switch on the back, note the position and move it back and forth through the range and back to the start point. If none of this works beat the living shutup out of the gauge as it has bitten the bullet! Good luck finding one I looked for over a year and MASI looked for several months.

What does this mean ( Take her stopedal working )............

I think it is a drunken Tachometer stopped working.

My tach hasnt worked in over a year. My starter hasnt either though.

I did find one on Facebook boater page it was a perfect fit, someone was putting in new gauges in i got lucky, i ran into the same thing last year but mine went to 1700rpm and just stoped. GOOD LUCK

Im pretty sure the square part is removable and can be put on another gauge.

The square part comes off