LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

wiring in oil pressure and water guage

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Old Feb 29, 2004 | 05:32 PM
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wiring in oil pressure and water guage

i have these 2 autometer guages, i am lanning on using the stock senders, but off each sender is 2 wires which wire do i splice into?
Old Feb 29, 2004 | 05:45 PM
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anyone
Old Feb 29, 2004 | 06:32 PM
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ttt
Old Feb 29, 2004 | 08:00 PM
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You can't run two gauges from a single sensor, at least not when the sensor is pure resistance device like a 2-wire temperature thermistor. Putting two gauges in parallel affects the resistance of the circut and screws up the temperature readings. You need to add a second sensor for the coolant. I added mine by putting a brass "tee" in the coolant line coming from the back of the heads.

Not sure how the oil pressure sensor works... If it's a resistance device that is supplied a bias voltage... e.g. like the MAP or TPS sensors(3-wire) you can run two gauges in parallel. But if its a 2-wire resistance device you need a second sensor. What year is your car? 94 and up have a plugged tap in the block right above the oil filter that can be used for an oil pressure sensor, or a line direct to a mechanical pressure gauge. That's where miine is connected.
Old Feb 29, 2004 | 08:04 PM
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I was hoping you would anwser this fred, my 2 guages arnt working right since my white overlay install, si ill unhook them. if you know what i mean
Old Feb 29, 2004 | 08:17 PM
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I have a 96

so you are saying right above my oil filter there is a plug that is capped off there, that i can screw the sensor into, if so that is awesome, as for the water temp, i know there is 2 wires on it, but you said you put a t fitting in the coolant hose of the rear of the heads, and you scred the new sensor into the brass fitting corect?
Old Feb 29, 2004 | 08:37 PM
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Originally posted by blazzinbird
I have a 96

so you are saying right above my oil filter there is a plug that is capped off there, that i can screw the sensor into, if so that is awesome, as for the water temp, i know there is 2 wires on it, but you said you put a t fitting in the coolant hose of the rear of the heads, and you scred the new sensor into the brass fitting corect?
The water temp sensor that is in the head (feeds the gauge) only has one wire.
Old Feb 29, 2004 | 08:44 PM
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You can also add another coolant temp sensor on the passenger side head. Since the heads are the same, there will be a plug on the side of the head between cyl #6 and #8. It can be hard to access, though.

Second coolant temp sensor

You can see the extra coolant temp sensor in the brass tee. I needed it because I run both the stock PCM and an aftermarket engine management computer and they both need coolant temp. You can also see dual IAT sensors in the airbox, for the same purpose.
Old Feb 29, 2004 | 08:52 PM
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ok i just went and checked and i was wrong guys there i sjust 1 line for the temp, so that is a easy one, and fred told me about the pressure sensor by the filter so that takes car of that thanks guys
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