quick coolant temp sensor question

[lolcantturn]

So I have to replace the M50 coolant temp sensor with an E30 one. On the thermostat housing of AN M20 ENGINE, which one of the sensors do I need? And on the M50 head, is it the sensor nearest to the rad support or nearest to the firewall? Thx guys!

[scottinAZ]

its the brown one with a single terminal on the M20, On the M50, IIRC its the black one, towards the back.

[7pilot]

Single terminal.....Gauge
Double terminal....engine management.

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[lolcantturn]

Thanks fellows !

[lolcantturn]

Do I have to rethread anything?

[scottinAZ]

on an M50, no, it should thread right in. with other engines (mostly OBDII), you would have to rethread.

[TimKninja]

Mine threaded right in. Im actually using a black single terminaled sensor and it seems to be reading fine.

[86325LSD]

so how does a single pin get put in a spot for a double pin? what wires getting connected to what?

Im about to do this too. Its on a m50NV and its going into a 1991 318i.

Do i need to change the cluster to a 325 gauge cluster to match the temp gauge.

[lolcantturn]

so how does a single pin get put in a spot for a double pin? what wires getting connected to what?

Im about to do this too. Its on a m50NV and its going into a 1991 318i.

Do i need to change the cluster to a 325 gauge cluster to match the temp gauge.

I texted you the answer ;)

[FredK]

The answer is on the E30, the connector has two pins in the connector core, but one of them is unoccupied.

[maclogos]

I am having the same issue with my temp gauge not reading correct temps. Gonna be replacing this sensor on my m50 swap as well. Thanks for the great info guys!!!