1991 f150 4x4.

when i got the truck, the head lights were wired to a toggle. one was brighter than the other. had the original sockets,no bright switch on the floor. i put the bulbs back in the orignal sockets, installed a new broght switch.they work fine.just the driver side is out, only turns on when brights are on.

also i have aftermarket oil prss gauge,and water temp gauge .water temp dont work. battery guage in dash reads nothing, oil pressure gauge is pointed side ways,temp gauge in dash is past overheated, fuel reads 1/4 tank, earlier it was empty.

also that plug on the intake (its a inline 6, 300 cid.) rite after where the air hose clamps to the intake , that plug was unplugged, so i plugged it in, and engine races its self.unplug it, runs fine, plug it in it races.
(truck was a automatic ,converted to a 4spd with granny low, has the iron trans and tcase. anyone got a diagram of the plugs on this motor? theres some stuff un plugged.
on the pass side of the motor, in between them air pipes on the manifold , theres a male plug not plugged in.dont know where to plug in all this stuff.
ill get some pics posted of the things unplugged and post them.
also my blinkers blink REAL slow, any way to speed em up?swap flashers?

any help would be appreciated!!!!!!!!