One of the senders is for the gauge, the other is for the TCS system. I'll need to check out my old info but I believe it was there to advance the ignition timing when the coolant reached a certain temperature (near overheat) to help cool the engine down.
Hope this helps,
Lloyd
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Regards,
"455HO" Lloyd
2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98
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