They are both powered by an 8 volt regulator on the cluster. When that regulator starts going bad the gauges dont get any power and stop working. If you Google it it there is a simple procedure to replace it if you are handy with a soldering iron.
if your 1987 Nissan pickup leak water from manifold what do we do
connected to your water pump.
No It Can Not.
in front of radiator,its connected to your fan blade.
Sounds like you've lost a head gasket.
Front top of the intake manifold.
right below your thermostat housing
JUST FOLLOW THE FAN BLADE AND YOU WILL FIND IT ON THE FRONT OF THE MOTOR
the fan clutch is built into the water pump,it cant be separated,you have to replace the water pump.
your water pump has to come off then you need an new gasket put back on
This fix it took us approximately two and a half hours
theres water in fuel filter. theres a drain plug at bottom