Temp gauge wiring

[General984]

Hi guys.
Recently I've done an M43 swap in E30.
The engine I took out from 1997 E36 has single temperature sensor so my gauge doesn't work,and I cant fit an E30 sensor in there.
So I managed to fit E30 brown temp sensor in my upper radiator hose,so now how should I wire it up to work?
Thanks

[superj]

what year is your e30? if it was an eta powered car, there is a wire on the c101 plug that you can hook to the temp sensor wire from your new sensor and the gage will work.


we just did a motor swap in my son's 86 325e, to an I motor and the we verified wiring colors with a meter so we knew the brown single pole temp sensor wire was a certain wire. when we did the swap, all you have to do it splice that temp sensor wire to the c101 plug and the temp gage started working.

[General984]

Its year 1985 and it has square type connector

[superj]

oh man. above your glove box, do you have the little white 3 wire plug that went into the old eta harness? that is where the temp gage wire was so you could run yours right to it

- - - Updated - - -

I realize I put the wrong connector in my first post. it goes to the c104, not the c101 plug.

[General984]

So I just wire it to harness not to ECU?

[superj]

On the older motronic system, the temp gage went from the sender to the three wire plug that plugged into the green box next to the ecu, in the glove box. So if you had the little green box by your original ecu, then you wire from the sensor to the gauge cluster, through that plug. If you have an m10 powered car, its probably identical because the m10 318 cars would accept an m20b27 eta motor and harness without cutting any wires or splicing junk together. They seemed to be made to be swapped out