Check the control unit as the pins in their can sometimes push out.

Hi Steven, I been ask to send you a pm , from oldfella...

Because i brought some defis of him, and i have a problem with the oil temp ...

To be honest there pretty easy to fit and much like plug and play .. they all work fine except the oil temp one, it doesn't to be reading to temp of the oil .. Power is on but red light flashes, i have try'd to disconect the oil temp via the plug and its the same

He said you might be able to help ? many thanks chris