@Cuppa yeah I could not justify chasing the fault. I replaced the sender twice and confirmed it was in the loom somewhere so made it redundant.

If it suits me I will put tape over it so I can't see it. It really did my head in and sat on H at idle.

I'm not convinced yet that I have not done damage to the car but we will see. I have to learn the car again now as the factory gauge has a massive blank in the middle of the range where the redarc shows every degree. I just need to learn what is normal.

I run a double gauge in the GQ and took a fair bit of notice on the last trip what the aftermarket was reading against the factory gauge.