the_merv

iTrader: (88)

What wire on a LS1 F Car does the Colant Temp Gauge get it's signal from? I have it traced in the Harness from the Sensor, but which wire actually sends the Signal to the Gauge..how is the Gauge wired?

hpmotorsports

iTrader: (5)

What year harness and sensor are you using, 98 is the only ect sensor that will run a gauge, 99 up are serial from the pcm.

the_merv

iTrader: (88)

I am using a 1999 Harness.. you say it's the Serial Data wire?

Steve VanS

iTrader: (1)

Hi

Just get another sensor and screw it into the plugged port at the aft end of the RH head (LS1 LH head is "swung 180" and mounted on the RH). Then wire to your guage on the dash. The port is M12x1.5

We did this on our E30-LS1 swap. We had to drill & tap the existing port in the RH head for a BMW temp sensor (9/16-18 -- I thought those guys were metric) and then ran a wire to the dash guage. The existing sensor in the LH head still goes to the PCM, with no changes. This worked for us because our sensor is a 1-wire type that gets power from the dash and completes the electrical circuit by being grounded at the RH head.

If your sensor is a 2-wire type (power from battery source, thru sensor, to guage, then from guage to ground), just wire it like that.

Steve & Garret building the 357is

Thaniel

iTrader: (2)

I'd like to know too. I've been looking at wiring digrams but haven't found which wire connects the instrument panel to the PCM for temp. I plan to put on an extra sensor like everyone recommends but I still can help but wonder how the factory car was set up.

Anyone?

G-Body

iTrader: (4)

The factory temp gauge is fed by the PCM via serial data. There is no single specific wire set aside for the temp gauge, it is part of the class II serial data that is sent between the cluster and PCM/BCM.

the_merv

iTrader: (88)

Yea, I got another one and put it in the right side Head, wired it in the Harness. The only problem I see there is that it gets hot back there, real hot.. anyone think that it will throw the Gauge?

hpmotorsports

iTrader: (5)

It shouldn't affect the gauge the coolant is what it will read ,outside shouldn't affect it.

daniel6718

iTrader: (36)

i did it, put it in the back of the passenger head and it reads 245 all the time, just below the orange...i guess since its right next to the exhaust port...the check gauges light comes on because it soo hot

01WS6/tamu

iTrader: (37)

Just buy the 98 3 wire sensor and change the electrical connector. The green is for the gauge and the yellow and black provide the ect signal to the pcm.

the_merv

iTrader: (88)

I wonder if I can get the Sensor in the Water Pump..

daniel6718

iTrader: (36)

no, you swap to the 98 sensor...easy fix....just need to find that plug....

the_merv

iTrader: (88)

I already have both Sensors, and they are plentiful and the Plugs are everywhere.. something can be made..
How much was the '98 Sensor?

daniel6718

iTrader: (36)

the 99 was like 14 bux, but i dont have a 98 sensor or plug yet, ill go buy the 98 sensor, but the plugs goana be hard to find....
any other cars or makes it came on?
daniel

Jhankinson

iTrader: (1)

Yeah they came on tons of cars with the 3 prong...2nd Gen S10's being the most likely. Both 2.2l and 4.3l used a 3 prong plug.

the_merv

iTrader: (88)

I couldn't find that Sensor.. I am trying something different...

hpmotorsports

iTrader: (5)

its not going to accurate for engine temp up there

daniel6718

iTrader: (36)

yeah i would think not also, its comming out also so its going to read even more cool

the_merv

iTrader: (88)

That's the in-line, and why don't you think it's goin to be accurate? The way I have it, it's goin to be surrounded by Coolant, and that Coolant comes hot out of the Engine..