I have twin AF 4500s. Plane has been flying 4 years. In the last few months I am getting intermittent low fuel pressure, low oil pressure, and high oil temperature reading with audio warning. Everything else is normal and engine runs fine. I checked the ground on the firewall manifold that the fuel and oil pressure sensors are mounted and it looks go. Actually ran a ground wire from my grounding block to the manifold mounting bolt - problem went away, but came back. Any help would be appreciated. Bob