Notice

NOTICE: Please anticipate up to a 5 business day turn-around on repairs after we have received your unit in for service

Occasionally the oil sender unit will short out internally and cause the needle to peg out but return to 0 when the key is turned off.
If you suspect a faulty sender, unplug the sender and inspect for oil leakage and monitor the gauge's reaction with it unplugged to see if you get the same reaction.