First off white smoke? And oil level to high,dont you have a dip stick check the level for starters.Check the oil for water and check the water for oil in it.
Temperature gauge not working,start under the hood ,you shoild have a temp sending unit right on the thermostat housing,check first off if a wire is hooked up to it next it could be that the sending unit is bad.but start there and make sure the wire is not broken and start following wire all the way to you go under the dash to the plug that goes in to the back of the dash panel.There is 1 big plug and a speedo cable that goes in the back of the speedo or instrument cluster.
As for the rear blinkers,first off assuming the fronts work flasher is good but did you start by checking to see if the bulbs are burnt,did you try the hazard switch to see if that turns them all on first to,and if that fails pull apart the bird nest tyou talk about and check all the wiring.