I was Driving my 2003 Disco in town needed a ride was going through withdrawl from being on vacation. The oil light flickered at a red light that was 2 blocks after start up. I went straight home shut her off and let her set for an hour checked the oil she had the proper amount of oil per the dipstick. My thought was/is to get a new oil sending unit new filter and oil as she will soon be ready for an oil change in another 1500 miles anyways and see if this fixes the problem or should I be looking in another direction such as changing out the oil pump straight away. My Buddy who has been a very good auto mechanic has always told me to start with the cheapest item to repair first if I wasn't certain. The theory behind that being you don't want to buy a 500 dollar part only to find out it was a 15 dollar part problem.