[DeTomaso] Oil Pressure Gauge

[Larry - Ohio Time]

Mike is correct when saying the sender is varying the resistance to ground.
A sender for an idiot light (or idiot gage) is just a switch (NC) that opens
when you have pressure.

To test the sender you can disconnect its wire and put your (-) lead of your
meter on the sender and the (+) lead of your meter to battery voltage (+).
Motor is off 0 volts. Start motor and you should see voltage increase as the
oil pressure goes up. I like to use the older analog (gage with needle) for
this kind of testing.

To test the gauge I made a tester out of an old gas tank sending unit. This
works the same way as the oil pressure sender but it allows you to move the
float arm to increase or decrease the resistance. I attached one clip to the
frame of the old sender and another to the sender lead. To test the gauge
one wire goes to ground (-) and the other to the sender wire. With the key
on the gauge should move when you move the sender arm. Simple

Larry - Cleveland



-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf
Of Mike Thomas
Sent: Wednesday, August 31, 2016 8:26 PM
To: detomaso at server.detomasolist.com
Subject: [DeTomaso] Oil Pressure Gauge

I'm trying to figure out why I'm getting a pegged reading on my oil pressure
gauge.  It will show normal pressure as the car starts, but soon after pegs
to the right and stays there.  Everything runs fine otherwise.  I've swapped
out the pressure sender, NAPA OP6091, and it's still pegging, so I'm
suspecting the gauge.  Anything else I could check?

Thanks
Mike Thomas
Pres., Panteras Northwest
Yellow '74 #6328



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