temp gauge fault

Oh the joys of a P38 4.6!!!!!!!!!

I have done a search and found nothing, Does anyone know what the problem is with my temp gauge? Dash is saying temp gauge faulty (is it just the gauge??) and gauge has red light on and sits on max temp then flicks to min temp even from start up! please help!!! Thanks

have a look at your earths or heat sender on top of heads....where is best place for a replace ment engine just found out mine got block fever

also if you have had an alternator recently check the plug is not cracked on top of temperature sensor