I just installed this on my 84 2.5l Fiero.
My temperature gauge is not moving.
I check to see if it would peg when grounded and it does.
The other lead will turn on the coolant light when grounded(while car is running)
I tried to check the resisitance on the sensor but could only get a reading between the pins, not by grounding to the body of the sensor.
I checked the resistance from the body of sensor to anywhere on the block and got 0 ohms. So its grounded.
Could I have purchased the sensor for the ECM by mistake?
I replaced the sensor because the gauge wasn't working from the person I bought the car from. It seems that the sensor had been replaced by him also because it looked new.
It also looks just like the one I just bought.
Should I purchase the style of sensor that looks like the original?

[This message has been edited by DJV (edited 05-22-2013).]

There are 2 sensors. One is for the ECM, the other is for the gauge.
I think you've both replaced the one for the ECM.

The plug for the gauge sender is more square.
http://fierostore.com/Produ...s=51404&lp=52440&p=2



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[This message has been edited by fierosound (edited 05-22-2013).]

Thanks guys.
Going to order the right one and post back.

Bump

Check the wiring at the gauge (for proper resistance).

You mean, check the resistance at gauge terminal to see if the reading is the same at sensor?

quote Originally posted by DJV: You mean, check the resistance at gauge terminal to see if the reading is the same at sensor?

yup. Check the wiring this way.

Rechecked gauge with various resistors (that are on a chart somewhere else in this forum) to check accurate range and found it way off.
The grounding method showed needle pegging and using a 45 ohm resistor would also peg it.
But when checking temp relative to resistance value I found it real wacky.
Hence, the gauge is shot.
I don't know if I should replace it with another used p.o.s. or use a new aftermarket gauge and sender.
I've already sunk $80 in sensors and pigtails. Now I'd have to spend at least $60 for a used gauge that may do the same thing down the road. And an aftermarket gauge look like crap just hanging around. Any ideas?