Oil Pressure Sensor/ Switch Output to 0-5V
This idea started with me thinking of adding an oil pressure sensor to my current system. There are plenty of pressure transducers out there that have a linear response and would be very easy to add on to my system like the one below:
https://www.amazon.com/Pressure-Tran...r+fuel+100+psi
This got me thinking, my car already has a factory oil pressure sensor/ switch and it would be really nice if I could just take the data coming off of that sensor and convert that data to a 0-5V output that I can input into the MPSciLink and data log that as well. So I dug into the factory system and the sensor looks to be resistance based. I went out to Rock-Auto and found a part number of 1S6621, which has an alternate part number of PS204, manufactured by Wells. I went to their site and found the data sheets and here is their data for the PS204:
PS204 (View Image) | 1/8-27 NPTF Dryseal |
- Switch closes 6-10 PSI
- 90 PSI - 35-40 Ohms
- 40 PSI - 40-50 Ohms
- 10 PSI - 45-55 or Open
- 0-3 PSI - Open
|
Looking at the wiring diagram, there are 2 wires going to the sensor, the GRY/YEL looks to be for the sensor and that goes to the gauge and BCM. There is a second wire that is GRY and that seems to only be for a pressure switch.
First question is, how accurate are these sensors? Should I just add another Tee Fitting to the line coming out of the block before the turbo feed and run two sensors?
Just starting my initial research.
Re: Oil Pressure Sensor/ Switch Output to 0-5V
The original factory sensors/guages are notorious for being inaccurate. Both oil pressure, and coolant temp. I can't imagine the aftermarket replacement is any better.
If you want accurate readings, I'd go with something aftermarket like what you linked to.
Re: Oil Pressure Sensor/ Switch Output to 0-5V
From the shown specs of the PS204 it is inaccurate so it is best to stay away