Hi All
Thats correct AMR1253, my mistake.
1- The sender was corret. The second one I bought was Bearmach one. I have fitted the new thermostat and the gauge reads halfway. Strange I can't recall the old gauge ever reading low. But do recall that during winter the heater didn't get as warm as in the past. I thought the heater matrix needed to be bleed.
2/3- I have spoken to CwazyWabbit and he is willing to adjust the mileage and pluses, which is great!