water temperature switch questions
Thread Starter
Joined: Jun 2005
Posts: 881
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From: NE Arkansas
Car: 1971 Camaro
water temperature switch questions
Converting from a one-wire (idiot light) to a two-wire (guage) temperature sensor on my 1992 5.7 TBI engine. It's in my chevy truck but the wiring should be the same as F-body.
What does the second wire go to? Is it a ground?
Thanks in advanced
What does the second wire go to? Is it a ground?
Thanks in advanced
Re: water temperature switch questions
It doesnt work that way
Cars and trucks still use the one wire sender for the gauge and the 2 wire CTS for the ECM/PCM
You need to plug them up correctly or neither will work and the engine will run rich/lean
Cars and trucks still use the one wire sender for the gauge and the 2 wire CTS for the ECM/PCM
You need to plug them up correctly or neither will work and the engine will run rich/lean
Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: water temperature switch questions
The sender unit for the idiot light is just a off/ on switch that turns on at low oil pressure and the one for a pressure gauge is a variable resistance that changes with oil pressure .
Both 1 wire so just install the correct type sender unit
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Joined: Jun 2010
Posts: 298
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Re: water temperature switch questions
I think the OP wanted water temp, not oil pressure lol. I'm interested in this as well, not sure if my factory temp gauge is accurate.
Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
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