SonexBuilders.net

To all who can help,
I am installing analog "steam" gauges in my Onex.
The problem I am having is selecting a tach that will work with both ignition systems through or with the toggle switches that are used for both the electronic and
magnetron systems.
Do I have to have 2 separate tachs, one small digital for one ignition and a primary analog tach? one connected to each ignition system?
The easy way out would be to install one small digital tach for each system..(cheating?)
How does this work? As I understand it, here are different pulses from different systems and the tach (or tachs) have to be selected accordingly.
Any and all help is greatly appreciated.
Frank
ONEX 090

Frank,

At Sonex we pull the tach pulses off the alternator rather than either ignition system. The alternator puts out 6 pulses per revolution. Find a tach that will work with that setup and you're all set.

Hey Frank

I am in the same place as you and while I found some possible models online, I cannot determine if they work as Joe described.

If you find a specific model that works please post it and I will do the same.

Here are some examples I found - not sure if they will work

http://www.vdo-gauges.com/instruments/by-type/programmable-tachometers/vision-black-4-000-rpm-2-1-16-tachometer-12v.html

http://www.vdo-gauges.com/instruments/by-type/programmable-tachometers/series-1-4-000-rpm-3-3-8-tachometer.html

http://www.vdo-gauges.com/instruments/by-type/programmable-tachometers/viewline-onyx-4-000-rpm-3-3-8-85mm-tachometer-12-24v.html

http://www.vdo-gauges.com/instruments/by-type/programmable-tachometers/viewline-ivory-4-000-rpm-3-3-8-85mm-tachometer-12-24v.html

Blue skies
Robbie

Sonex1517 wrote:Here are some examples I found - not sure if they will work....

Robbie and Frank,

According to the downloadable instructions posted on these web links, any of these tachs should work with a 6 pulse per revolution alternator. You just have to set the "dip" switches to the correct settings. Check out the instructions under the "downloads" tab about halfway down each page.

Thanks Joe!

Robbie

Joe, Thanks very much for your help.
This has made my life a bunch simpler!
Frank
ONEX090