So i just picked up a 90' Pathy SE and have some questions/problems

My gas and engine temp gauge aren't working. Assuming a connector has come unplugged behind the dash. The previous owner installed an alarm just recently. Anyways what is the size of the fuel tank so I can judge my gas consumption?

Headlights don't work either. Daytime running lights(Canadian Model) come on when the engine is running, and the high beams work, but no power to the regular headlight wire when the headlight switch is turned on. Is there a relay for the headlights that may have failed? Where are they located? My 240sx has headlight relays under the hood, Very few relays are under the hood in the Pathy

Thanks

The tank is a 20 gallon. About your lights, I'm not sure on that. I had a problem with mine not working about a year ago and it turned out to be a wire had come unplugged on a relay at the battery terminal. But nothing on mine worked at all, no hi or low beams.