Air Intake Temp using stock components
The remote temp sensor for the overhead display is located behind the grille, in front of the A/C condensor. It should be the one on the left side, facing the front of the car. The sensor's range is from -49 degrees Fah to 140 degrees Fah. It is a variable resistor sensor, that changes resistance with temperature. It should have a resistance of 9K to 11K Ohms at 68 to 72 degrees. The other sensor is for the NGC Engine controller. They both mount to the same stud and nut, with the ambient temp sensor (for the overhead display on the left).
If you were to extend the harness to allow the sensor to be relocated inside the airbox, or whever the air intake receives it's flow, it would give you a head's up display of the temp of the air going to the intake. It would use the stock overhead display, and provide a much more pertinent reading than the outside air.
Other possibilities would be to monitor any temperature not expected to exceed the sensor's range.
The service manual picture shows the sensor plugging directly into the harness at it's mounting point. You may be able to make an "extender harness" from connectors gathered at a junk yard, or you could cut the connector off and splice in the needed length of wire(s) to extend it to where you want to relocate it to.
Be sure to check that you have the right sensor by unplugging it and checking the display. You may either get a blank display or a check engine light. A blank temp display is probably good; the check engine light would mean you either got the wrong sensor, or the service manual has the positions reversed in the pictorial.
I haven't tried this; just got the idea from looking at the service manual. It should be a nice and fairly easy mod, for anyone that has ever put in a car stereo, and is familar with wire polarity and making inline splices. I would suggest butt connectors and heat shrink tube. Cut the wire first, slide on a piece of heat shrink that is twice the length of the butt connector, crimp, slide the heatshrink over the butt connector and heat the heatshrink tube to seal the crimp.
I may try to do this in the next few days.
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