hello everyone. I recently pruchased a 2002 trailblazer LT. Lately I have been experiencing a scary situation with this vehicle. Approximately 1 out of every 5 times that I start this vehicle up, the oil pressure guage reads "0" and my dashboard displays "Turn engine off." This does not make any sense to me. I turn the engine off and when I start it up again, the guage reads normal. I dont understand...please help. Is it possible that the guage could be malfunctioning? Why else would the guage read "0"...every now and then?