Recently changed headgasket on my car, before it was overheating when stationary but glued to the top edge of the blue on the temp gauge when car was traveling normally. gasket and termostat have been replaced, but reading still on the low side of the 90 line, nearer the blue when air is flowing through the rad. should i look at the coolant temp sender? (if so what multimeter readings should i expect?)

regards

Ali