Originally Posted by
wstefan21
Interesting! That does tell me that the transducer still functions as a low pressure/high pressure switch and should cut off if low pressure is observed to protect the compressor. It just does so by measuring high-side pressure instead of low-side for cycling, but it does sound like it does cycle.
The transducer is just in itself a variable resistor controlled by pressure. Thereby it changes voltage based on the pressure between 0 and 5V, so picking that resistance places it's voltage drop within the acceptable range.
While this certainly will work, there's no protection for when the pressure is low. Generally not a huge deal unless you're low on refrigerant, but still potentially something that can kill your compressor.
Fortunately for me, I've got a service port with a Schrader valve and correct pitch, so this is about as easy to install the correct sensor than a resistor anyhow, so I'll probably go this route.