Scottish Elises

Started bleeding the coolant after the radiator/jenvey installation and noticed that there is a discrepancy between the ECU coolant temp and stack display. They are out by 10 degrees (Stack = ECU + 10). When the stack temp senderfails, does it ever over read the values?? I always thought that the Stack sender (blue) was more prone to issues but it under read when failing. ECU temps are sutting around 82 - 90 while bleeding and since I have the 82 degree PRRT thermostat I'm thinking that ECU temp is correct. Any thoughts or should I just replace both senders to be on the safe side?

Just replace. They are cheap and easy to do in situe. Good to have confidence in the displayed temp.

cheers Ferg, the brown sensor was replaced 18 months ago (2000 miles) but I've ordered up both from Rimmer Bros and they should arrive by Tuesday

I need to do the same on my new one.