The transducer is available at both Autozone and Parts America. If you can't get one of them to get it, I'll go get you a part number. It's only 30-40 dollars there. Return the dealer part, IMO, but some would prefer the dealer part.
Removing the transducer will release Freon, as Paul said. I went ahead and replaced my schrader valve when I put my new transducer on, it took some work to get the tool I had in there to remove the valve, but swapped in a new one. Then the transducer will make SOME leak as you remove or install it, but it won't be much.
Keep us posted. I changed my transducer, and it worked fine for about 2 weeks, then failed. I changed transducers again, and it's still broke. I had changed the wire harness to a late model end, any supplier you buy from will have the new style plug and you'll have to do the same probably.
If you have to get a new harness... do yourself a favor and cut a pigtail from a salvage yard (bring your new sensor so you know you get the right end), and then splice it to your harness. Just match up the colors.
I need to go fix my splice I think. Make sure you solder your joints and then protect them well. That I think may be my problem, as the signal from this switch is very sensitive to voltage variations. I've just got some quickly crimped connections wrapped in electrical tape (Hey, it was a parking lot repair, give me a break