It could be a small unit in the brake lines to the rear brakes or a lever operated unit bolted to the chassis with a spring attached to the axle housing
SOURCE: how to change fuel pump 1990 cadillac seville
The fuel pump and sending unit is located in the tank. I hope your tank is empty, if not you will need to siphon it out. It is dangerous with the gasoline, and remember the fumes burn, not gas. You start by removing the filler hose, then loosen straps, detach sending unit wire and fuel line, then lower tank. Then unscrew the sending unit/pump and replace. reinstall.
SOURCE: Dash lights in '90 cadillac seville not working
Most likley the instrument dimmer switch and that is part of the headlight switch, try wiggling it to get them on.
SOURCE: 1990 cadillac seville heater fan wont turn on
relay and blower motor should be checked and replaced if necessary.
SOURCE: My 1990 Cadillac Seville says
You may have a failed ignition lock cylinder The wires that are attached to the lock cylinder are probably broke therefore the resistor value of the key pelet is not getting to the theft system module there fore without tha signal the car will not start. to repair the car will need a new lock cylinder and at least one new key
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