Temp gauge light on, needle low

[trevor]

Hi all,
First post in a while as the d2 has been going well as of late. My current issue is a small one I believe (and hope). It's regarding the temp gauge as the overheat light is on and the needle all the way down. I have read this to be caused by the engine coolant temp gauge not to be receiving any input. So I assumed its an issue to do with the wires underneath the dash coming through the firewall as I installed my inverter today and perhaps knocked them loose but I didn't find any loose connections. An interesting fact is that the nanocom continues to give me the coolant temp; I guess this rules out the temp sensor. Checked the fuse so any idea of where to start will be greatly appreciated.
Thanks :)

[Pinelli]

Cables behind the dash perhaps?

[clubagreenie]

Nanocom takes temp from ECU. Plenty of coolant? Light + hot, no temp + no water.

[trevor]

It was a cable but not a loose connection; it was right at the firewall and about 8 wires had chaffed through or something. All good now and auto elec said it could've been much worse and possibly killed the Ecu if they touched each other.