Re: Sending unit mystery for 1972 TCS system - need sage advice
The TCS system uses thermal switches and relays to roll back the timing and downshift the transmission in a pathetic attempt to control emissions. The two terminal sensor controls a vacuum switch and a relay set to a warning light.
Most of those devices were removed just after clearing the dealers lot. I don't fully understand how they work and I don't really care too. If you are doing a full resto on a truck you can find plenty of info on the net.
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VetteVet
metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide
Growing old is hell, but it beats the alternative.
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