Part number - red engine clip...

[ultra_joel88]

That goes into the fuel pressure sensor watchamagit - the one that connects to tuning boxes.

Mine fell out and has become lost

[VRStu]

Do you mean the red locking tab on the engine harness plug? If so then I'm pretty sure you'd need to buy the whole plug.

It's not fuel pressure sensor related.

[ultra_joel88]

yeah the red locking tab... looks like a trip to the scrapyards in order then