You can use a pot or resistors but you need the specs. No need for power, just turn the key on and put the resistors across the pins the sender is tied to on the harness plug.
Push the front of the seat rearwards while pulling up firmly. It will pop loose.
Alternately ground and open the sender signal line and look for a change in the guage.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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