ok so i just purchased a 93 altima gxe as a second car.
my issue is the spedometer will occasionally stop at between 35 and 45mph and stay there until i come to a stop, where it suddenly will drop to 5, and as soon as i start moving, back up it shoots

so here is my questions:
has anyone had this exact issue, and what was your fix?
is there one or two speed sensors on this car (its a manual transmission)
does anyone have a wiring diagram for the speed sensor, or the testing procedures?