I got the knock sensor from MSD
looks like it was not made by MSD and they are merely
re marketing the device made by: 

Autotronic controls Corp.
1490 Henry Brennan Dr
El Paso Texas
79936
915 857 5200
fax 915 857 3344

The big advantage over a simple audio amplifier are the LED's that light up.
The knock sensor comes with an adapter which is unlikely to fit
the Mazda knock sensor hole but I see no reasons the stock Mazda
knock sensor will not work with this device. I will have to look into
that. Worst case we will have to machine an adapter.

I'll ship it to you in a few days Tom after I fool with it a bit.

Paul Lamar
 
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