Air Pressure Transducer

[Chuck Thigpen]

Does anyone know of a source for a fairly low cost Air Pressure 
Transducer that measures positive and negative gauge pressure? 
It doesn't have to measure extreme pressures.  I'm looking for a 
transducer that will measure boost pressures of up to 30 psi and
vacuum down to - 14.7 psi.  It would also be helpful if the 
transducer was linear in measurement.  Any help on any transducers
would be greatly appreciated.  
Chuck Thigpen
90 300ZX 2+2
92 Honda CBR600F2 (Racer)
89 Yamaha FZR400 (Racer)