Civerus

iTrader: (2)

So my carb setup is near completion (it runs, great actually) I did this setup for several reasons due to my EFI system being beyond saving, so please, no flaming.

Now, I have everything running, except my water temperature gauge (I know I should just get an aftermarket, but it'll bug me). I figured, that when I removed the ECU and harness, I pulled out the wire to the gauge, now I am curious as to whether the gauge is fed through the ECU, or straight to the gauge from the sensor (by the oil pressure sensor).

Maybe Hailers could chime in here. I would like to make it work, but I am not sure if this is fed through the ECU or straight to the gauge, and I am junk at reading wiring diagrams (I can, but half the time I'm lost).

I would also like to know if any other gauges read through the ECU (got the tac and speedo working, battery working, oil pressure is dead (using aftermarket gauge), fuel and water temp are dead atm, fuels always been dead (yay top off every 100 miles).

So anyone got a solution to this backward problem?

HAILERS

The water temp signal went from the sender on the engine...........thru the harness that was on the engine (EM harness).........into the passengers foot well...........to a ORANGE in color connector with 13 sockets and it mated with a YELLOW/BLACK wire in that connector (upper right hand corner of that orange plug) and then that yellow/black goes thru the Front harness to mate with the METER harness plug and the yellow/black wire now turns into a yellow/white wire in that meter harness which connectst to the back of the combination meter to feed the gauge. I'm saying one of the round plugs on the back of the combination meter will have a yellow/white wire and that wire is what feeds the water temp gauge.

You could run a new wire from the sender on the engine......to the passengers side of the interior.........connect it to the yellow/black wire in the thirteen pin, orange in color plug and the gauge should now work.

Fuel gauge has zip to do with the harness on the engine or the ECU itself. Water temp also has zip to do with the ECU itself.

The above was for a non turbo car, series four. A turbo cars water temp wire will be found in the other orange plug in the passengers side foot well, a 21 pin connector.

Civerus

iTrader: (2)

Awesome, works, on an S5 N/A its orange/white wire before and after the 13-pin, to clear that up.

Two more questions Hailers, what about the factory oil pressure gauge, which color-code would that be?

Also, how on earth do you kill the add coolant buzzer, since nothing is there to tell it that it has coolant now.

Civerus

iTrader: (2)

Alright got the add coolant buzzer fixed, grounded it for now until I can get a hold of a new radiator sensor.

Now, all I need to know is how do I connect anything to a stock oil pressure sensor, its an S4 sensor, and will it work with an S5 gauge cluster?. Where is the wire located and does it connect to the same harness as the coolant temperature sensor connected to?

HAILERS

Odd. On a series five the water temp wire should have been a yellow/white wire in the EM harness at the sender...........goes to the plug called X-11 (a twenty pin plug) on the passengers side foot well .........then thru the front harness to the IC connector called X-21 (another 20 pin plug).......to the back of the combination meter on a still yellow/white wire.

You removed the EM harness so the yellow/white does not exist anymore.

The oil pressure wire yellow/red is in the engine harness which is on the left side of the engine bay (it is NOT part of the EM harness which is wrongly called the engine harness and causes me to write this little note 'cause nobody wants to call BOB..BOB, but wants to call BOB...FRED which confuses everything and sure enough Shirley will respond instead of BOB).

Anyway, the engine harness has the oil pressure wire along with the cables to the battery etc and runs on the left side of the enigne bay and in turn connects to the FRONT harness which also runs on the left side of the engine bay (plus inside the car). That yellow/red wire in teh engine harness gets connected to the Front harness in the engine bay by a plug called X-07 (a ten hole plug) and then travels into the car on the Front harness and connects to the IC harness that feeds the combinaton meter and the wire is still yellow/red as it enters the instrument gauge.

The elimination of the EM harness has zip to do with the non working of the oil pressure gauge since it's wiring goes thru the engine harness. I've no idea why it does not work unless you left the wire off the sender or have the plug called X-07 disconnected.

See diagram attached out of the series five manual

While both oil and coolant overtemp wires both go thru the Front harness ..........the only elect plug they share is the one that connects the Front harness to the IC harness and that's located under the dash. That plug called X-21 carrieys the tach signal also and since you have no problem with the tach, I assume the plug called X-21 is connected up to the instrument cluster........meaning those oil and coolant signals should be getting to the gauges. I've no idea why they are not. See attached jpg.

Civerus

iTrader: (2)

What I'm saying is, when I got my car, it has some aftermarket Glowshift gauges in it, with an aftermarket sender. Whel when I pulled my block out, my sender got uh..'caught' on something and kinda snapped the pegs off.

My new block has a S4 sender in it, and I cannot for the life of me -find- the factory oil pressure gauge wire in the engine bay. Does it come out right near the rear rotor leading plug?

Also, what your saying is, if I can find this wire, and hook it up, my S5 gauge cluster will work with an S4 oil pressure sender?