Oil Pressure
If you are talking about the Vans electric oil pressure you will need to install a 90 or 45 degree fitting at the engine location and a hose to a remote location for the sender. The fitting at the engine should have a restrictor. The oil pressure sender must be grounded. Vans has an instruction sheet for the electrically powered steam gages. Be sure you get the wires hooked up correctly, reversing the wires can trash the gage.