TL150/MTL25 Mustang Starts but shuts down in seconds.

Help! Oil/coolant light flashes after the machine runs for 5 seconds or so. We tried grounding out the coolant sensor...same thing happens. Removed the oil sender wire and the same thing. I unplugged the coolant sensor relay...same thing. If we plug in the bypass wires on the back, the machine will run but the oil/coolant light blinks. Any help would be greatly appreciated.
Thanks,
Robert

TL150/MTL25 Mustang Starts but shuts down in seconds.