I have an 84 L69 with all the computer stuff removed. I believe the sensor on the lower right side of the block (around cyl #4) is a knock sensor (?) My questions are:
1) Can i wire this to a warning light on the dash?
2) How? Is the sensor an open/close type like a fan switch or is it a variable voltage/resistance switch like a temp gauge sender or O2 sensor.

 

It's a sensor that spits out variable AC voltage. You would need an electronic circuit to translate that into some sort of bar display. They do make something like that... look in Summit's catalog.

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92 Z28 L98 350
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Ported and polished heads, ported stock TPI base, ported plenum, Comp Cams XR270HR-10 cam (lift .495/.502 duration 218/224 lobe separation 110), Edelbrock TES headers, LT4 valve springs, Crane AFPR, Flowmaster catback with LT1 style tips, MSD coil & wires...

"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)

 

thanks for the quick answer. Ill check summit. My though is that the sensor can detect much smaller levels of detonation than i can.