1999 Skoda Felicia 1.3 base model   Hello, for a while now my temp gauge has read 20 degrees low. Engine temp verified at 83 degrees with infra-red thermometer and VC. Both thermistors in sender reading about 330 ohms at that temperature (within 25 ohms of each other). Wiring good from sender to cluster (<1 ohm resistance) and ground good at sender (<1 ohm to battery -). I put a 300 ohm resister across the gauge terminals at the sender and the gauge still read about 65 which is a