RT115 Tier 2 - CONTROLS 17 If pressure is still low, consult Engine Manual . c00ic046a.eps Engine oil pressure indicator will light and alarm will sound if engine oil pressure is low. Engine Oil Pressure Gauge This gauge shows oil pressure. Normal operating pressure is 15-50 psi (105-345 kPa). CONTROL CONSOLE DESCRIPTIONS Press button to sound horn. Check oil level. p If pressure is low: Horn