Oil pressure sensor help

[Buffetkiller]

Im having issues with my new oil pressure sensor and gauge which i think im wiring wrong. So about a month ago i had issues with charging and i had the cluster takin apart about 4 times unpluging it and looking at stuff to fix the charging issue. Well the last time i plugged everything back in the oil pressure gauge never worked again. I wasnt too worried chances are my oil pressure is fine beings tho i was messing with stuff and i had a electric gauge and sender on the way!
So i since have hooked it up and kinda winged it as far as what colors are what. I bought what is pictured and hooked red:12v black:ground and green:gauge. My oil pressure on my aftermarket gauge only reads zero and never moves but i have been reading online that the sensor i got needs 5v reference on one of the wires. Has anyone had any experience with this style pressure sensor?

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[BeastMaster]

Most I have seen in that form factor are designed to feed a computer.

They run from 5 volts. Many are ratiometric, meaning the output also tracks supply voltage. Inside is usually a balanced differential strain gage, with a differential amplifier chip to amplify it's millivolt output to something in the order of 0.5 to 4.5 volts, given 5 volt supply.

https://m.aliexpress.com/item/32945...d=1701amp-Hck9DDYvx94pce0qYAidTw1568845120316

The above link may help with your wiring.

Incidentally, this one interfaces perfectly with Arduino computers.

 

[Buffetkiller]

Darn. I knew i got the wrong one, should have sent it back. What sensors do all you guys use to feed an electric gauge? Theres a million different types

 

[dgr]

What gauge are you speaking of? Factory or aftermarket?

Automotive gauges of this era use a ground reference to determine oil pressure. The sending unit either provides a range of resistance, say 30 to 240 ohms or it is really a switch that closes at 5 or 10 psi.

 

[dgr]

https://wellsve.com/parts/index.php?PART_KEY=006423020&PART_NO=PS142
Here's the one for my 86. Under the specs it shows it is an actual pressure sender. Sort of.

https://wellsve.com/parts/index.php?PART_KEY=006422943&PART_NO=PS164
Here's the one for a 1992. It's just a warning light switch made to look like a sender for a gauge.

 

[Buffetkiller]

Ok sorry for the late reply. Its an aftermarket vdo. Thanks for the parts hyperlinks ill take a look at em

 

[Buffetkiller]

So the first one for the 86 is the one i would want to run a gauge right? My gauge just needs a ground?

 

[dgr]

If it was mine, I'd spend the $45 on a vdo sending unit and be done with it

 

[dgr]

If your gauge is 0-80 psi, get the 0-80 psi sending unit from vdo. If it's 0-150, get the 0-150 psi.

If you want a warning light for low oil pressure, they have those too. You don't need a dual station as those are for one set of gauges in the engine room and one in the cockpit. If you buy a floating ground sending unit, you will need to run a separate ground wire to it. That's a waste of effort in my opinion.