*credit to Tom Bauer
eBay search: Pressure Transducer Sender Sensor 0-4.5V Stainless Steel for Oil Fuel Air Water
Amazon search: AUTEX Pressure Transducer/Sender/Sensor 150/200 Psi Stainless Steel Compatible With Oil, Fuel, Air, Water (150 Psi)
*Be sure to get the 150# version