These high quality, low cost pressure transducers work with all the major ECU manufactures such as; Holley™, Fuel Tech™, Haltech™, LinkECU™,MoTec™, AEM™, Cobb Tuning™, MaxxECU™, PROEFI™, EMTRON™, PE-LTD™, Megasquirt™, BigStuff™, FastXFI™ and many others. 

899 series = oil filled silicone piezo electric transducers. +/- 0.5% accuracy at full scale. 

799 series = Dry ceramic pressure transducers with +/- 1% accuracy at full scale.