tachometer

I’d love to upgrade my tachs , much more useful instrument on a diesel boat. Please post boat porn pics!!!

On the list but down behind; move boat home, get head and generator working.
 
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Here is the picture of the tachs installed. I opted for the black bezels.
 
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THJeff said:
I've been meaning to post a pic for awhile. Here is my install with the black bezels. Everything worked out just as you described. Thanks again for all of your help. You're right, it was quite easy but I would've never tried to do it myself without all your guidance.
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Just saw the pic, and your install looks great! Glad to be able to help, and hope you have a great season!

-Tom
 
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In the process of doing mine screws are temporary until 4200 dries. Could you please tell me what type of adhesive you use to glue the two halves back together?
 
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TNT8808 said:
You'll laugh, but my first try was 4200 and Gorilla tape. It worked, so I just left the tape. Also, I put a very thin bead of 4200 in black around the Aetna to secure it to the old gage.

-Tom
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Thank you
 
Riptide III said:
Thank you
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Loctite also makes a product specifically for plastic that Home Depot stocks. Although I haven’t done this project yet (waiting to find donor tachs), I have used the Loctite stuff on other projects and it works really well.
One of the projects was the little plastic plunger pin that is on the latch that holds the cabin door open in place. Mine was cracked and broke in half two years ago. I fixed it with the Loctite stuff and it’s still held together perfectly! Can’t even see the repair and that thing gets moved up and down a lot more than the tach housings will ever be moved around.
 
Does anyone know if these tachs are going to work straight out of the box or am going to need to set or adjust anything
 
Riptide III said:
Does anyone know if these tachs are going to work straight out of the box or am going to need to set or adjust anything
Click to expand...

These work by "counting" the teeth on the flywheel. So you will need to know that number. Once you set that, they are are plug and play.

For Cat 3126's (and 3116's too I think), the flywheels have 126 teeth. I cant see what engines you have, but post it up.
 
Truly a plug and play deal. No wiring needed just mount the tach and connect the wires. Since Aetna uses the Cat tooth counter, there are no adjustments to make, other than setting the dip switches on the back of the Aetnas.......but use the little plastic tool that comes with the tacos because the switches are delicate and easy to damage.

The most opportune time to change to Aetnas is when you replace your dash panels. You can then just have the new panels made with the proper cutout for the Aetnas. My boat came with 5" tach cut-outs which is too large to make a new bezel that looks decent, so I waited a year until I was ready to deal with replacing the dated panels and changing about 100 switches.

For those of you that are trying to mount the Aetnas into the old Sea Ray housing, keep in mind that someday you may need to send thew Aetnas in for service or repair. In 10 years.....about 1000 hours I have had problems that required sending both of my techs in for repair at different times. For me is was a 5 minute job to remove a tach, but if you mount the Aetna inside an old Teleflex case, it could be more of a job to get the tach out and clean up the adhesive on the Aetna case.
 
A little late for me to worry about adhesive,but thank you. I'm a little confused. Aetna uses cat tooth counter but there are dip switches I have to set? Crap, time to read the directions to find the settings.
 
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