guage issues on 91 stingray 3.0 merc

[Fscott4]

Trim and speedo.
Trim motor works fine with no problems at all. When trimming down the unit will work flawlessly but the guage stops registering trim at halfway. I did remove the trim sender as I thought maybe that was the issue and all I would have to do was reset the drive gear on the unit and put it back on...nope. when I rotate the gear on sending unit it does drive the guage but only to halfway, keep turning and it returns to full up on the guage. I am now using halfway on the guage for down. Big deal? nope, would I like it to work? yup.
Also the speedo is intermittent. I did put a new pilot tube on but did not change the tubing to the fitting on the transom. When I blow into the tube it does affect the speedo so Im not sure thats the problem.
Any thoughts on these things will be welcome.
Thanks!

 

[mr 88]

My thoughts, could care less about the trim gauge , should adjust by the way it rides without looking at any gauge . Speedo , GPS on cell and mentally take note of RPMs to speed so you don't have to keep looking at your cell , more accurate than your tube .

 

[JimS123]

My Stingray came from the factory with intermittent speedo problems. Right off the bat I replaced the entire length of tubing and sealed both ends tight. I found a kink in the original tube. 35 years later it still worked perfectly - within 1 mph of GPS.

 

[Fscott4]

tube was kinked at the inside of the transom. Straightened it all out and the speedo is within 1 mph of the GPS. Thanks for your help!!!