What is this?

[WE4Turbo87]

Hello, I just bought a 87 WE4. It only has 10k original miles. It has this box mounted under the radio. Does anyone know what it is? Thanks

 

[pacecarta]

looks like a knock gauge

 

[THensley]

and a ALKY light to the right

 

[1986 Buick GX1]

As mentioned it’s a knock detector.
The green light indicates it’s ready for use. The red lights record how many knock events occur, usually through the 1/4mi.
The red lights accumulate from left to right and stay lit while the green light goes out (I think).
It will reset after 1 min or so to give you time to look at it, the red lights will go out and the green light comes back on telling you it’s ready for use.
They used to say 4 lights were acceptable during the 2-3 shift, but any more than that was bad.

 

[WE4Turbo87]

Thanks guys. None of the lights are on, so I'm not sure it works anymore

 

[JayC]

Thats the OG knock detector gauge. A local guy to me used to make them and I sold them to Kirban for a while.

Guy also made the best voltage pump booster Ive ever seen but he only made a couple of units. It was far superior to anything out at the time. It used an RC car battery to increase voltage to the fuel pump.

 

[V6sleeper]

Had one on my car for years way back, green status light should be on at all times. might be BGC unit

 

[1KWIKSIX]

I’m guessing some sort of engine knock detector , the red LED’s light up progressively with Knock