I've been interested in propane conversion for a while, seems to be popular overseas....

I'm trying to figure out how to do the fuel gauge - these guys say their gauges will hook up to a pressure sensor and can be programmed from empty to full:

http://www.auroragauges.com

does anyone know where to get a pressure sensor that would work with these?

Also looks like they have boost gauge options....

 

on my race car, i have a sensor, since propane is a gas, the way the gauge works is it just sensors pressure, high pressure = full and low pressure = empty, even with big tanks and small tanks (pressure is the measure) there are a few sensors you can buy. you can even just buy a manual pressure gauge for propane tanks

 

I don't see how a pressure sensor is going to be able to tell you how much propane is in the tank. Remember that in the tank, propane is a LIQUID and not a gas. Therefore, as you use the propane, it just boils away until the pressure in the tank is equal to the vapor pressure of the propane at the temperature inside the tank. So as long as there is at least SOME liquid propane left in the tank, the pressure in the tank is going to depend only on the temperature. Once the pressure starts dropping (and not as a result of dropping temperature), you are already on empty. Of course, barbecue grills basically use a scale as a fuel gauge. A lighter tank = an emptier tank. But this would probably be quite a bit harder to implement on a car.

 

hehe throw a tripple beam in the ride