There is a grey 4 pin plug on top of the motor, close to the firewall, it controls the RPM, Speedometer, and Temperature gauges. Plug may become loose, causing no RPM needle movement.
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In a 1997 Nissan Altima, the transmission dipstick is located next to the motor. The dipstick has a red handle to pull out.
On a 1997 Nissan Altima the water pump should be mounted on the front of the engine. It is right at the thermostat housing.
Under the passengers seat.
The EGR valve in a 1997 Nissan Altima is located at the top of the motor in a position near the firewall. The EGR valve is held in place by a vacuum line and 2 nuts.
On the back of the engine underneath the intake. The easiest way to get to it is to remove the starter. Loosen the pipe that they put in front of it. Then you can change it. Its not easy.
It is located in or on the transmission.
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On the firewall on the driver side under the hood.
under the hood
How do i reset my anti-theft system in my 1997 nissan altima se?
1997 Nissan Altima with the Automatic Transmission - has 4 lug nuts per wheel