Knock Gauge - Black Face / Black Trim
The Electronic Spark Control (ESC) Module and connector --- I'm hoping --- should be all that I need to run the knock gauge. I think I am going to the wrecking yard for those items, but I've also seen correctly color-coded connectors on e-bay that match up to the Casper Knock Gauge
Terminal A is not used
Terminal B is switched power
Terminal C is the signal wire, which splices in to the wire that goes to Terminal B7 on an ECM-equipped (TBI) system. I don't believe that the ECM provides any feedback to the gauge
Terminal D is for engine ground
Terminal E goes to the knock sensor
The AFR gauge looks like a piece of cake to wire: Installation Video
The supplied cable is pretty much 'plug and play' from the O2 sensor to the gauge. All you HAVE to do is supply a switched power source and a ground and you're good to go!
Some of these components are designed to be used on TBI applications and an ECM ...
BUT I'm thinking that if you JUST had the Spark Control Module (or Relay as they call it on an 87 Buick Regal ... which is the same application that Casper's instruction are for.)