What does the fuel cut off switch look like and where under dash is it on a 1988 ford bronco?

There isn't a readily accessible, dedicated "fuel cut-off switch" under the dash of a 1988 Ford Bronco like you might find in some other vehicles. Ford didn't typically include such a switch as standard equipment in those years.

To stop fuel flow in an emergency, you'd have to either:

* Disconnect the fuel pump relay: This is a much more reliable way to stop fuel flow than anything you would find conveniently located. You'd need to consult your owner's manual or a wiring diagram to locate the fuel pump relay in the under-hood fuse box or a secondary relay center. Disconnecting this relay will interrupt power to the fuel pump.

* Disconnect the fuel pump's electrical connection: This is more involved and requires working under the vehicle to access the fuel pump itself.

Therefore, there's nothing that looks like a readily identifiable "fuel cut-off switch" under the dash of your 1988 Ford Bronco. If you find something that *looks* like a switch, it is almost certainly *not* a fuel cut-off switch. It's much more likely to be something else entirely.