. OPERATION DETAILED CONTROLS AND GAUGES 3 - 10 Hydraulic Oil Temperature Monitor Monitor (2) warns op erator that th e hydraulic oil temperatur e has risen. If monito stop the monitor r lights up re engine and (2) changes d during wait until to green. Check fo cause o Engine Oil Pressure Monitor (3) lights up red if the engine lubrication oil pressure goes below n ormal level. stop he e ngine immediately, eve engine o li ghts up