Installing a pressure sensor directly to a vibrating engine is asking for problems. And if you have a Honda K24, you better be remote mounting every sensor possible.
1/8BSP to 3an adapter. 3an SS 12in coasted line. 3an to 3/8NPT adapter. 0-150psi Pressure Sensor.
Honeywell 0-150psi Sensor
Scaling:
0 = .5v
150psi = 4.5v