Late-80s inertia switches can be where subford's diagram shows, or just R of the tunnel.
I thought I had a chart of fuel tank sizes, but I can't find it.
It may be easier to lift the bed off than to drop the tank, so consider it.
Fuel level senders are available from Ford & PartsPlus+, but these PNs may not be current.
TSB 88-18-03 Fuel Gauge Erratic
Publication Date: AUGUST 31, 1988
FORD: 1987-88 MUSTANG, TAURUS
LINCOLN-MERCURY: 1987-88 SABLE
1988 LINCOLN TOWN CAR
LIGHT TRUCK: 1987-88 BRONCO, F-SERIES
ISSUE: An erratic fuel gauge needle when the fuel tank is 1/2 to 1/4 full may be caused by excessive wear of the resistive film on the fuel pump sender assembly. The wear occurs during transporting of the vehicles via rail or truck over long distances. The fuel gauge will indicate correctly from a full tank to about 1/2 or 1/4 tank of fuel. When the fuel gauge needle is below the 1/2 to 1/4 tank range the needle will swing all the way above the full mark on the fuel gauge.
ACTION: To correct this, install a new fuel pump sender assembly. Refer to the appropriate 1988 Car/Light Truck Shop Manual, Section 24 for detailed service information. Refer to the following fuel pump sender application chart for the correct service part number.
Fuel Pump Sender Application Chart
Model Year Application Engine Tank Size Service Part
1987-88 Mustang 2.3L./5.0L All E7ZZ-9275-A
1988 Lincoln Town Car 5.0L All E8TZ-9H307-G
1987-88 F-Series/Bronco 4.9L/5.0L All E9VY-9275-A
1987-88 Taurus/Sable 2.5L 16.0 E8DZ-9H307-F
1987-88 Taurus/Sable (W/ Tripminder) 2.5L 18.6 E8DZ-9H307-E
1987-88 Taurus/Sable (W/O Tripminder) 2.5L 18.6 E8DZ-9H307-A
1987-88 Taurus/Sable 3.0L 16.0 E8DZ-9H307-C
1987-88 Taurus/Sable (W/ Tripminder) 3.0L 18.6 E8DZ-9H307-D
1987-88 Taurus/Sable (W/O Tripminder) 3.0L 18.6 E8DZ-9H307-B
PART NUMBER PART NAME
E8DZ-9H307-A Fuel Pump Sender Assembly
E8DZ-9H307-B Fuel Pump Sender Assembly
E8DZ-9H307-C Fuel Pump Sender Assembly
E8DZ-9H307-D Fuel Pump Sender Assembly
E8DZ-9H307-E Fuel Pump Sender Assembly
E8DZ-9H307-F Fuel Pump Sender Assembly
E8TZ-9H307-G Fuel Pump Sender Assembly
E7ZZ-9275-A Fuel Pump Sender Assembly
E9VY-9275-A Fuel Pump Sender Assembly
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION DESCRIPTION TIME
881803A F Series Aft Of Axle Tank 1.2 Hrs.
881803A F Series Midship Tank 0.9 Hr.
881803A F Series Both Tanks 2.0 Hrs.
881803A Bronco 1.2 Hrs.
881803A Lincoln Town Car 1.4 Hrs.
881803A Mustang 0.9 Hr.
881803A Taurus/Sable 1.0 Hr.
This is the current PN for all '96 Broncos.