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Calibrate Sensor Webinar question - wiring

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I will have to go back and watch this webinar again but Andre talked about data sheets for sensors, mostly aftermaket. I have been learning alot about the wiring side of tuning (watched the wiring fundamentals a few times already) and I know this does not directly relate to the sensor calibration in the ecu but how do you go about finding resistance information on OEM engine sensors for choosing the proper awg for a harness build. I am mostly referring to older 90's to early 00's model Japaneses cars, not sure if that really makes a difference.

As an example, I am information gathering for a project USDM 95 240sx ka24de engine and I need to wire this into a sr20 ecu running a nismotronic unit . I have referenced the manuals and have found specific information to be lacking in regards to resistance for choosing awg size.

I also was looking for resistance for the continental flex fuel sensors earlier and was not able to find that to choose the proper wire size. (one of the guys on this forum was nice enough to tell me which gauge size to use.) but I want to know how to get this info myself.

I may be way off in my thought process but I just seem to be missing that "ohhhh now it makes sense moment" I am hoping you guys can point me in the right direction.

Most sensors will use very little current, and so 22awg wire is more than sufficient, this is one of those things you don't need to worry much about, just use 22 awg (or larger) for your sensor wiring. You typically only need heavier gauge for solenoids, coils, and perhaps injectors (and other vehicle systems such as lights, pumps, fans).

Often the 5V power supply for an ECU may only have 200 - 500mA total capacity, so you can be sure that temp & pressure sensors are typically 10-50mA (or less). For example a common thermoresistive temp sensor might have a resistance (at some temperature) of say 100 ohms, so even if 5V went through that, it would only be 50 mA (typically there is a pull-up resistor that divides the voltage so you might only have 5mA of current consumption in the wiring).

It is often helpful to look at the factory wiring, and notice the size of wiring they have used. It's not uncommon to see 22-24 AWG wiring.

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