i had the same problem with myn first i tought it was the seal than i find out that the gearbox tail had a very deep but fine scratch. so i changed the oil seal again but befor i put the new one i done a bit of sealer. and that was it stil good till after 2 years
ye sthe fuel gauge and the other gauges looks ok but the temp one that is not marking good so i try the white one . igot the red but its not marking good.