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Re: Trying to find the vsb (vehicle speed buffer).
I have the same issue on my '89. I've mentioned it before; the speedo drops off to zero when I'm driving down the road and I hear the engine change tone since the speedo is tied in to the ECM and is in the process of going open loop. I give it the "Fonzie whack" on the face of the cluster and the speedo starts working. I've tried re-soldering micro-opens on the circuit board and that hasn't worked yet or I didn't find the right connection points. So in the meantime I use the cruder repair method.
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1989 K1500 Chev. EC
Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit.
2009 Hummer H3T 3.7L 5M (sold)
1997 K2500 Chev. EC 7.4L/ 4L80E
2018 Dodge Ram 2500 HD R/C
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