tachometer

THJeff said:
My tachs have never been right since I've owned my boat but last year the port tach pretty much stopped working altogether. I've read several threads here about pulling the tachs and cycling a cylinder switch in back. Is this the same process for tachs with diesel engines? If not, can this re-calibration be accomplished some other way for tachs with diesels?
I'm tempted to just replace them since they are the original tachs. Are the Aetna digital tachs still the best ones to use? For those that have made this upgrade, which model is better 8905R or 8402?:
http://www.aetnaengineering.com/model-8905r-lcd-tachometer/
http://www.aetnaengineering.com/model-8402-led-tachometer/
Lastly, if I go this route and replace them, is it possible to advance the hour meter to the current number of hours on the engines?
Click to expand...

If you have some electronics savvy, It's possible with a pulse generator. This is a small circuit board that sends out pulses, thus simulating an engine running. I think i got mine on Amazon. You hook it up on the bench and just let it run for the requisite number of hours. But don't over-shoot, because there is no way that I'm aware of to "wind" them backwards.
 
Ray,

There is one other thing I'll pass on if you are doing your first Aetna tach installation: The dip switches in the back of the Aetnas are very, very delicate. Use no metal tools, nothing sharp and don't let the tool you use on the dip switches slip off. I've had the switches on both of my Aetnas come loose requiring that they be sent back to Aetna to have the dip switch assemblies replaced. The last time, I said to hell with it and just sent Aetna the switch settings back with the tach which has worked extremely well for me. The dip switches were set correctly and they have stayed put.

In the grand scheme of things the repair was minor annoyance given that the Aetna folks are great to work with and very accommodating........and their tachs are far superior to the Teleflex OEM tachs.
 
fwebster said:
Ray,

There is one other thing I'll pass on if you are doing your first Aetna tach installation: The dip switches in the back of the Aetnas are very, very delicate. Use no metal tools, nothing sharp and don't let the tool you use on the dip switches slip off. I've had the switches on both of my Aetnas come loose requiring that they be sent back to Aetna to have the dip switch assemblies replaced. The last time, I said to hell with it and just sent Aetna the switch settings back with the tach which has worked extremely well for me. The dip switches were set correctly and they have stayed put.

In the grand scheme of things the repair was minor annoyance given that the Aetna folks are great to work with and very accommodating........and their tachs are far superior to the Teleflex OEM tachs.
Click to expand...

Thank you for the heads up, I did set them and was very careful to switch them with the provided tool. The folks there at Aetna have been fantastic. I think I have them set correctly according to the provided graph.
 
I believe that I have these set properly according to the graph in the back of the manuals.
Does this look correct for a 126
IMG_9646.jpg
 
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