no where
the fuel filter is located on the firewall
Under the dashboard in the left compartment
Usually located in a removable housing at the engine end of the upper radiator hose
yes
Under the drivers side dash
The 1989 Honda Civic is not equipped with an EGR valve.
see this wikianswer page, the CRX and the DX are almost the same, http://wiki.answers.com/Q/How_do_you_replace_the_thermostat_located_on_a_1989_Honda_CRX
The spark plug gap for a 1989 Honda Civic LX is .044" (1.11mm).
The temperature gauge sending unit, located on a 1989 Honda Accord LXI is located on the thermostat. It is the small connection with a single wire sticking out of it.
In the intake manifold plenium, its a 2 wire sensor
The Throttle Position Sensor is located on the throttle body