Thanks Mike, the tach functions properly when the car is running. When the car does start with all components in place the tach works along with everything else. While cranking the engine I see the tach needle jumping slightly so it looks like a signal is being passed. If I remove the fuel pump relay and jump the pins, the fuel pump runs and the car will start and the tach functions. Thats why I am wondering if there is some kind of intermittent circuit in the klima relay, it appears it is getting the rpm signal it needs but not passing it on to the fuel pump relay.