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Rb25 Coolant Temp Sensor Values

Simon-S14
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Simon-S14 Grand Master

Simon-S14

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Keen to know what the resistance valves for the dash gauge are for the rb25 are. Ive put a 25 into my 32 and i cant get the dash gauge to work... its all hooked up to the right wire. Have had the motor running for quite some time and the temp gauge just wont move.

So the single pin blue/black wire that goes to the dash.. what reading does it out out at cold temps and at operating temps.. does anyone know?

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https://www.sau.com.au/forums/topic/171224-rb25-coolant-temp-sensor-values/
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blind_elk Grand Master

blind_elk

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Ever consider the sender might be kaput? Have you tried using the sender from your old RB20?

To confirm the gauge works (which presumably it did before), try earthing the sender wire (with IGN = ON) - if its the same as for oil pressure, the temp gauge should go to "full scale".

Simon-S14 Grand Master

Simon-S14

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already done that, thats how i know the wiring is right since i earthed out the connector from the sender (took it off first) and the gauge reads full. sensor may be busted... but i have had the multi meter on the sender and it reads around 150 ohms resistance with the motor running for about 15 mins... so i have no idea if that means operating temp or what... since the dash gauge reads full with 0 ohms... so i assume the lessere the reading the hotter the temp?

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