Equus 6234 2" Mechanical Oil Pressure Gauge, Black Black colored face with numbers in white; black pointer with black and white bezel Gauge diameter is 2 1/16-in and reads from 0-100 PSI Sending unit is mechanical with 90 degree sweep Back-Lit illumination for night use Gives advanced warning of incorrect oil pressure, low oil level, defective oil pump, restricted oil lines, clogged oil filter, and low oil level