Re: 50 PSI Oil Sending Unit

Posted by jdemaris on March 05, 2006 at 17:32:02 from (69.67.234.223):

In Reply to: Re: 50 PSI Oil Sending Unit posted by TimWafer on March 05, 2006 at 15:04:52:

What you say makes perfect sense. I didn't start listing all the variables in order to avoid confusion. Besides what you already mentioned, some OEM gauge systems use a voltage regulator and run all the electric gauges on low-voltage - including the fuel, oil-pressure, temp, etc.
Back to your sending unit. If your gauge only goes to 50 PSI - it takes a certain amount of resistance to ground to allow it to read so. It could be zero ohms if 50 is the end of the range. So, it might use, e.g., 300 ohms at 5 PSI, 150 ohms at 25 PSI, and 0 ohms at 50 PSI (I'd don't know, I'm just guessing). If that WERE the case, the sending unit would be cataloged as 325 - 0 ohms descending - zero ohms at 50 PSI, and then whatever type of thread and connector it uses (e.g. NMPT 1/8" with a spade push-on connector, etc.). If you want to check your gauge function, you need either a variable resistor - or if you're lucky, the correct fixed resistor. Gauge diagnostic kits usually come with such a variable resistor. This way, you'd hook it up, turn the dial until your gauge maxes out, turn the knob the other way to get the gauge to read zero, and read the resistance readings.
If you can't get help from your NAPA people and they can't find their own book (which happens often), I can look up the number for you. But, you have to post what it is that you want - i.e. type of thread, type of connector, ascending or descending, and ohm range at PSI.

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