1982 454 What does this relay do?

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Craig 85

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Location
Nashville, TN
First Name
Craig
Truck Year
1985
Truck Model
K30 SRW
Engine Size
454/TH-400/NP205
My K30 (454) has it, and after looking through my shop manual I found it. It is a ENGINE SPEED SWITCH related to the Throttle Return Control (TRC). My truck was built 11/84, so all my emissions labels say compliant to 1984 standards. Emissions changed 1/1/85. I know 454's went to dual smog pumps then. Based on what I've read it was used from 79-84.
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