Thanks guys! Let me know if you think I'm missing any parameters that should be taken into consideration when trying to make this measurement.
Probably the most important property for the pressure sensor you select for your application is it's compatibility with the media it's measuring, gasoline in your case.
Most inexpensive pressure sensors are designed for measuring just clean air or other inert gases. Some also allow contact with clear water. Pressure sensors designed for hazardous materials always use a sealed metal diaphragm between the media and the actual sensor element, typically using stainless steel, or in the case of when needing to measure a liquid acid media use hastalloy or other special metal diaphragm material.
Make no mistake that the required diaphragm isolated barrier is what makes such sensors cost significantly more then the sensors with no such barrier protection for the sensing element. You tend to get what you pay for in this line of sensors.
So check carefully the datasheet that covers the specific pressure sensor you are considering for it's media compatibility, never assume compatibility not listed, call the vendor if required. The other specs such as voltage/current measurement range are easier to work through once you get the basic safety required specs matched to your application.
Lefty