Are they electrical or mechanical? It is wise to retain the idiot lights for the oil and temp when using aftermarket gauges.You will always notice the light first before the gauge.Plus the oil gauge cuts of power to the fuel pump if there is no oil pressure at the factory sending unit.I added a nipple,tee,and an adapter to the stock setup for the oil gauge.For the ttemp is a little more involved,first the intake needs to be drilled and tapped to accept the gauge adapter in the boss on the front of the intake right next to the CTS.It is more diffucult this way but it offers the best possible protection.