My 89 F150 has a 5 spd manual OD tranny. Ammeter, Oil Pressure Gauge, and Temp gauge either are not working or working erracticly. Could anyone tell me exactly how to remove the whole cluster? I removed screws above and below but cannot seem to get it pulled out far enough to unhook wires & cables on back. Thank You firstname.lastname@example.org
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.
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You'll want to remove the electrical oil pressure gauge and check the oil pressure with a manual gauge to verify low oil pressure. If the oil pressure tests good with a manual gauge, then you either have a faulty oil pressure sender, or gauge in the dash (I rarely see faulty gauges). If the pressure is still low, suspect worn crankshaft bearings. There is also a possiblity that the screen to the oil pump is clogged. This can be visually checked by removing the oil pan and cleaned.
First off I wouldnt drive your car until you make sure that you have indeed oil pressure and that the gauge is a false reading, driving your car if in fact it has no oil pressure will severly damage your engine, but firstly i would check the oil pressure switch its located on the passenger side of the engine right back from the oil filter make sure the connector is clean and free from oil and corrosion if the connector appears to be in good shape take a paper clip and insert it between the 2 terminals inside the connector your oil pressure gauge should peak at 80 PSI that tells you that your gauge and all related wiring are good and in working condition, secondly remove the oil pressure switch and hook an manual oil pressure gauge up to you engine and start the engine the guage should have a oil pressure reading anywhere from 30 PSI to 55PSI depending on engine temperature if theres oil pressure on your manual gauge replace the oil pressure switch with a new unit, if you still have 0 PSI on your gauge then stop your engine immediatly and start looking at your oil pump and lubricating system for a problem.
Specifically what Needle is going back and forth? You need to be more specificfor anyone to understand what your difficulty is. Are you speaking of the Tachometer? Speedometer? Oil Pressure Gauge? Ammeter or Voltmeter? Temperature Gauge?
Could be the oil pressure sender has gone bad or worse case scenario the oil pump has worn out. Check the oil presssure sender first, if it is leaking around it then that is the cause, if not then you may be looking at an oil pump. Just had a 03 ram 2500 doing the same thing and it was the sender, but that was a hemi and it had 230000 miles and a month later had to replace the oil pump for same issue.
These cars are funky and this is normal...gauges on all of the earlier cars are for general reference...checking the oil level manually while the car is running and warmed up is the most proper way to do this...generally speaking, your pressure should drop as the car warms up, but still reach 5 bar on full accelleration (928's have the same gauge). The oil level gauge will actually increase as the car warms up...the difference can be dramatic.
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.