GM made 2 of these units. 1 was for cruise control (yellow 3 wire) the other was blue/green for tbi vehicles with cruise control (4 wire). both are 2k pulse.
http://www.oreillyauto.com/site/c/de...1879&ppt=C0033
http://www.oreillyauto.com/site/c/de...1879&ppt=C0033
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