Technical > Wiring & Sensors

BMW tachometer

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antonch:
BMW tachometer expects a square wave signal. MS folks use the following wiring scheme as shown below. Is that how I want to wire up mine?

jrussell:
No need for all of that complexity. You can just use a tach output from the ECU. You will only need to fit an external pull-up to 12V (the 1K-10K in that pic).

BenFenner:
This man speaks the truth.

rob@vems.co.uk:
Connection will be like this:

And the tacho config like this:

antonch:
Awesome, that will make things easier. I am not sure why MS has such complexity.
How do you determine what the resistor value should be?
How about Divider?

I have 3 trigger events per crank cycle.

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