Hi again
I found a manual with the impedance vs temp graph in it. The temp senders did not match this profile (despite being oem replacements). However, the wire that connects the lot (to my understanding) is supposed to be putting out 5 volts.
This wire fluctuates between 0-10 volts. Is this normal or have I found why I have been getting spurious temp readings during long drives? If so, my plan was to find the start of the wire, put a new wire in and connect straight to the sender as there are so many potential places the wire has become compromised.
Cheers
Hammo