4A-GE MK1 Engine coolant leak

4A-GE MK1 Engine, coolant, steel, housing, gauge, temp, unit, removing, tubing, sending, leak, advance, tube, starting, gasket, housing?thanks, change, leaking, housing.from, guys,i, developed, engine, tube.i, dried, inlet, pump, water, residue

hi guys,i developed a coolant leak and it is leaking from i believe the coolant temp gauge sending unit housing.from under the engine i have coolant on the steel tubing thats above the steel water pump inlet tube.i have a red dried residue starting from the tube that goes into the housing for the coolant temp gauge sending unit housing. how would i go about removing that housing and removing that steel tubing to change the gasket for the housing?thanks in advance jim