Oil Pressure Sensor + $6 + Spare PWM Output = Real Oil Pressure Gauge
#1
Oil Pressure Sensor + $6 + Spare PWM Output = Real Oil Pressure Gauge
Dummy oil pressure gauges suck. Swapping the gauge and sender also sucks. Get a real oil pressure gauge for a lot less suck:
1. Have real oil pressure sensor
2. Buy $6 worth of 180Ω 1-watt resistors
3. Replace both resistors in stock gauge with 180Ω resistors
4. Rewire the sender wire to a spare PWM output at your ECU
5. Use generic PWM output to control your gauge: 250hz, 100% duty = 0PSI, 0% duty = ~65PSI* for me, but easily adjustable via curve
6. Profit
* You can probably play with resistor values to get more range. I found 180Ω gave a wider range than 270Ω but did not test further.
1. Have real oil pressure sensor
2. Buy $6 worth of 180Ω 1-watt resistors
3. Replace both resistors in stock gauge with 180Ω resistors
4. Rewire the sender wire to a spare PWM output at your ECU
5. Use generic PWM output to control your gauge: 250hz, 100% duty = 0PSI, 0% duty = ~65PSI* for me, but easily adjustable via curve
6. Profit
* You can probably play with resistor values to get more range. I found 180Ω gave a wider range than 270Ω but did not test further.
#3
I have a 3-wire analog oil pressure gauge wired to the MegaSquirt which I used as a reference. Haven’t confirmed that the readings match with a mechanical gauge but as long as I have the correct voltage curve for the sensor that shouldn’t be necessary. I just used Generic PWM and tested which duty cycles resulted in which readings on the gauge and then create a curve of oil pressure vs duty accordingly.
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