I want to put in a 2 stage gauge pod , a water temp & oil pressure gauge. Do I just piggy back the factory sensor? If so will I get the correct reading out of both, ( the Temp gauge with the actual TEMP & the Oil gauge with the actual Oil pressure), as well as the factory warning lght. if I loose pressure.... OR will i have to disconnect the factory gauges, and if so will i have the idiot light on the dash ON all the time? Hope this make some sense...