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Old 05-16-2009, 07:54 AM   #1
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Build your Own Tach Adapter?

I've been piecing together the design for a Tach adapter to run off the Crank Angle Sensor and am curious to know if anyone else would be interested in it...

The first prototype cost under 10AUD to build and the second unit (with some input protection etc) is likley to cost just on 10AUD. That's about 1/10th the price of the Autometer unit...

If you've already made your own I'd be interested in learning about your solution...

Oh and no - on the Drive-by-Wire Aussie Duratecs there's no sign of a tach signal at the ECU :( It's all CANBUS...

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Old 05-16-2009, 01:53 PM   #2
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Good luck, do you have a ford tach driver to go off of are you just trying to figure it all out by yourself? If I remeber correctly a few people had problems setting up a tach with the autometer unit.
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Old 05-16-2009, 07:13 PM   #3
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Basically it's all about basic electronics. The crank sensors makes a pulse every time it passes a tooth (35 times per rev). All we need is one pulse per rev.

A couple of basic components to take the "weak" sensor signal and make it more useable and then a quick trip though a divider chip or two and then out to final conditioning step to make it pallateable to a Tach and voila done.

It's technically not hard if you're designing specifically for the 36-1 crank sensor setup..

I've got the divider working AOK and just working on the input filtering stage at the moment...

A.
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Old 05-16-2009, 07:57 PM   #4
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I'd like to see the schematic, like to build small electronic circuits like that. Just wondering what type of signal the tach likes to see?
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