check the cts is connected, its near the exhaust manifold in the cylinder head, this operates the gauge, if it is connected try earting the wire, the gauge should go to max, if it does the sender (cts ) is fubared.

start by checking the plug for the fan switch is connected, this is a iirc blue plug on the thermostat housing. if it is connected unplug it and bridge the terminals, if the fan then works (ignition on) the fan switch is bolloxed,

Try these areas first and report back, hth