Gills

Ok am in prices of getting up and running I have a v8 sti scdb with a crossover pipe that hasn’t got a hole for an individual temp sensor as it’s a my94 car.

can I splice one to the 2 pin connector on either wire to power the gauge?

JDM_Stig

iTrader: (3)

Early cars ran a sensor at the front for the gauge didnt they?
I thought it was later cars that had the 4 pin senor.

Gills

yes they do but with a different crossover pipe to allow for this.

I have the original 2 pin connector to one sensor and a spade connector spare at the min as opposed to the newer style with a 3 pin gauge integrated.

wondering if I can merge the old gauge wire on to the standard two pin existing to power the gauge and all from the same sensor as the newer models have?

1509joe

iTrader: (2)

I'd be 99% sure the answer is no iirc its a single wire connector for the gauge and a two wire connector for the ecu on the v1 to v4 cars after that its a 3 pin plug that does both.

Don Clark

The newage sensor has two pins for the ecu and the third pin for the temp gauge. the temp gauge side of the sensor earths via the sensor body to the cross over pipe which is why you should not use thread tape - only the supplied copper washer.


Newage arrangement


Classic setup

Gills

sorry wiring diagrams confuse the hell out of me, I haven’t used the tape, does that mean I can splice into one of the wires? If so which one?

Don Clark

Neither, buy yourself a newage temp sensor and wire accordingly - or get someone who knows what they are doing. That said, I'm assuming calibration for both parts of the newage sensor match that of the older classic versions.

1509joe

iTrader: (2)

I'm not answering anymore questions

Gills

lol I’m not ignoring you mate sorry, I do have the new age sensor but would need to know which colour wires go to what pins

Don Clark

As per the wiring diagram WG (White/Green) goes to the thermometer pin which is pin 3

Gills

so would pin 1 and 2 be in the same order on the early connectors ?

Don Clark

In theory it shouldn't matter which way round the two pins for the ecu temp sensor is connected.

Neilxr

Or you fit the Ver 2 water cross over pipe

Gills

ok I can only try it thanks don

Gills

you can’t fit a v1-2 crossover pipe on a later block due to the extra crank case breather outlet

Neilxr

Fit a ver 3-4

as have that on my spec c block

Gills

yeah bit late for that now as would have to disassemble inlet etc lol

1509joe

iTrader: (2)

Calibration for temp sensor will be wrong.

Neilxr

Or drill and tap a hole for the extra sensor

Gills

what about using the original sensor on an adaptor in a rad hose?

1509joe

iTrader: (2)

Would work the very best.

Neilxr

Single wire sensor in top hose won’t work

sensor is not earthed by its threads to metal

1509joe

iTrader: (2)

Is correct earth the connector to the block as well

Gills

Hi guys,

just thought I would update on a solution, so I had a 3 pin coolant temp sensor for the crossover pipe, basically I cut the excess of the plastic connector off and soldered the old gauge wire to pin 3, I then soldered the left wire of the original connector to the left pin, and the right to the right.

heatshrinked all connections so sealed and soldered on to wiring harness, hey presto it worked temp is fine, gauge works it’s perfect so now if I get a connector that fits and a new sensor it will be done properly but it does work.

to note left and right are both based on the clip at the top of the connector