RPM GUAGE/ SPEEDOMETER

[G-MAN]

My RPM gauge works half the time. I was thinking about changing it out. Is there anything special that you need to do or it just a snap out snap in type of thing? The boat is no longer made. Its a 96' Astro 18fs. Need some help on the particulars in replacing.

Also my engine is a Merc 150EFI , with the lack of better words, there is a port on the bottom of the engine for the speedometer pickup. I hit a log several years ago and it clogged up the port; therefore, no more speedometer readings. How do you fix this?

 

[nwright]

Just find another RPM gauge that will fit your hole and replace the old one. Disconnect wiring from old and connect to the new.

For the speedometer pickup-use a drill bit slightly smaller than the hole. Use your fingers, not a drill, to work into the hole to remove the wood. Sometimes backward air pressure is needed if you can’t completely clear it with the drill bit.

 

[sdfd29]

I used a hook point last week to clean out a small piece of wood in my speedometer pick up. You may need to straighten the hook slightly, an extra wide gap worked for me. We did not hit anything substantial, I guess it was a small branch or something floating.

 

[G-MAN]

Thanks for the help?

 

[dlmille]

Is this little port yall speaking of on the lower unit?

 

[sdfd504]

Yeah it is about half way down the front of the lower unit. It looks like a little cut and you just take a small hook or drill bit and by hand clean it out.

 

[dlmille]

Thanks learn something new everyday on here. Mabye my Speedometer will start working.

 

[Cutbait]

sometimes with an irradic rpm guage it can be in the wiring, such as a loose ground.Maybe something to check first. good luck