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Thank you, Bob. That is very helpful, and does explain things.
There is another sensor, on the E40D transmission. However, I believe it is also a variable reluctance type of sensor that produces an a/c output. This truck has a mechanical speedometer. In '92, the trucks include a PSOM module that converted the differential VSS signal into something more appropriate for the electronic speedo and odometer. It also downsampled to 8000 pulses/mile.
So I need to process this signal. I found the LM1815. It looks nice, but I would need to order that. I've found a few circuits that might work, but not any that included a success story. Still looking, suggestions appreciated. Especially for 'shackable designs that won't require an order.
It'd be nice if we had an example of a working circuit in the wiki.
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