Digital Tach Problem

[GoldenDawn]

My digital tach (Aetna Engineering) has gone wonky (digital reading jumps all around). Not sure how to trouble shoot - sender or readout. Suggestions. . Presently cruising Broughton Archipelago, Pacific NW.

 

[C lectric]

If yours reads from the flywheel which most do then it can be buildup of rust particles on the sensor end. Find it at the flywheel, remove it and clean the surface.

Reinstall turning it in untill it touches the flywheel , then back it out about 1/4 to 1/2 turn and set the lock nut.

The flywheel teeth create a magnetic pulse as they pass the sensor and rust will interfere with that pulse generation being read by the sensor.

Of course be sure the wiring is clean and tight.

 

[tiltrider1]

The sender is the more common source of problems. Might be as small as corrosion on the sender’s connector.

The more common failure on the gauge is loss of a digit.

 

[STB]

Do you have a magnetic or mechanical pickup?

 

[bayview]

+1for the above. darn good reliable tach

 

[catalinajack]

Damn good and very pricey. Programmable tachs from VDO are almost as accurate and way cheaper. Still, I list after the Aetna product. Both require a good magnetic pickup or signal generator. An alternator signal will not do, especially for the Aetna.

+1for the above. darn good reliable tach