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Re: What is this?
As has been said that's the Optical pickup for a VSS signal to the Cruise III Cruise Control. There should be a hole next to the speedo cable to insert that sensor on most 82 and later clusters.
The Yellow or Green box is a VSS buffer/amplifier. Not sure where Digital vs analog comes from. Yellow and Green do the same thing. The output signal is a square wave with a frequency of 0.556 Hertz/MPH.
Some of the cars used the signal for the early electronic fuel injection so the boards have two output connections. I believe the 87 and later trucks had a pass-through gear drive VSS in the transmission but don't quote me on that.
Download the Cruise III textbook from my manuals post. There's a bunch of info there. If your Cruise III is otherwise knackered good luck finding parts.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
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