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Quaker State Peak Performance 5W-30 5+ Jug 5 Quarts with filter change
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its time for new fuel filter, new fuel injectors, spark plugs, spark plug wires, cap and rotor. the engine in the tempo is a good one and if you take care of it that car should last quite a while longer..
oil pressure sending unit is close to oil filter.temp sending unit on front of intake.check fuses for temp sending unit and coolant temp gauges if all is good make sure grounding is good.if grounds good your gauges is faulty.
Some of the gauges are on the same fuse as the dome light; check the fuses. The other main source of gauge problems for this vintage F150 is the sending units and I don't use the term sending unit lightly, so when you go to the parts store make sure you say you are looking for sending units not sensors (sensors hook to the computer) sending units are of 2 types for this vintage F150, lights and guages you need the ones for gauges, the oil sending unit is about 4 dollars and the coolant temp sending unit for a guage is about the same.
I have 4 fords and you will come to understand that the wiring is a jury rig, all this come out when they are the age of your 1989 PU.
Disconnect the negative post on the battery. Support the tank with a jack with a plywood piece. Disconnect the metal straps holding the tank. Slowly lower the tank. Disconnect the fuel lines from the top of the tank and plug them with a screw or something similar in size. Remove the retainer ring holding the fuel pump/sending unit with a brass punch and hammer. Pull the fuel pump/sending unit out and replace it.
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