As Russell stated it is the Vehicle Speed Sensor. It is the optical sensor for cruise control. Here is a thread on what it looks like hooked up under the dash:
http://67-72chevytrucks.com/vboard/s....php3?t=167510
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Chris Lucas
1973 Chevy C-10
1978 GMC Jimmy (2WD) - SOLD
1987 R10 twin turbo LS
1991 R3500 SRW CrewCab
1985 K5 diesel swapped project
1989 K5 2WD conversion w/ Vette susp Project
Captkaos Customs
73-87chevytrucks.com
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