fuel flow sensing

[Clare Snyder]

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>Assuming rear wheel drive, mount the magnet(s) on the tail shaft of the
>tranny and the sensor in the tail shaft housing.  I believe the Chevy
>Impalas (now deceased) have a magnet in either the ring gear or pinion gear
>in the differential.  The sensor is mounted in the differential housing.
> You can adapt this theory to front wheel drive hardware to avoid the
>undesirable effects of non-rotational drive shaft movement.
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>Jeff

That sensor is likely the rear ABS sensor - can be used as a speed sensor if
ABS not enabled. Can also add an extra sensor on front ABS sensor, if you
are real handy.
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>Do you know how the Vehicle Speed Sensor works? I am currently working on
>a system that uses magnets fixed onto the drive shaft, and a hall effect
>transistor. The problem i have found is that the shaft tends to move
>around quite a bit (in relation to the rest of the vehicle). As i have
>mounted the hall effect device onto the underside of the car, it
>sometimese cannot sense the magnet becaues the drive shaft is too far
>away. I haven't had a second attempt yet (with longer magnets/stronger and
>moving the hall effect device closer) but i was wondering if there is
>some other way that i should maybe try.
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