I've got a buddy with an 06 Taurus that's been giving him fits lately. Cold or hot, get in the car, hit the key, she cranks, doesn't fire. I had him cycle the key on, off, on, off a few times to prime the pump a little extra, and it's helped until recently. I did a little digging and everybody shouted fuel pump, so Saturday I put a pump and a relay in it. Worked ok until today, doing the same thing again. He also says his guages are jumping when he shuts the car off. I do know the tach doesn't register for 10 or 15 seconds after the car starts. Any ideas what I should be looking for?