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Unread 10-06-2007   #1 (permalink)
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Default 1989 Mustang 5.0 Oil Pressure Question

I recently swapped an 89 motor and trans into a 90 mustang. This is the first time I have ever done anything like this. The motor has about 110000 miles on it. The stock oil pressure gauge reads between the second and third marks from the bottom. It seems like it likes to move around alot, going from the second from bottom line, then up to the third one ( center of gauge one ). Is this pressure to low? or does it need a sending unit ( not sure where it is but a friend mentioned it) Any help or advice is appreciated. Thanks

Also when driving the car it doesnt make any weird noises and accelerates smooth through all rpms. Thanks

Last edited by EagleAutosports; 10-06-2007 at 10:52 PM.
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Unread 10-06-2007   #2 (permalink)
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I still have the stock gauge in my 90 gt and it reads between the o and the r in the normal range. I had an 88 lx in the past and the sending unit to the gauge went bad. The gauge dropped to zero while driving down the interstate one day and I pulled over as soon as I could thinking that the engine was going to start knocking but then I realized it was the gauge. A lot of people will tell you to put a good aftermarket gauge in the car but if you like the looks of the factory one then just try a new sending unit first.

Oil pressure will change some on the gauge as the rpms increase. Passing situations will cause this . Oil pressure will also be higher on the gauge when you first start the car because the oil is thicker when it is cold causing greater pressure. As the car warms up and depending on the internal condition of your engine such as excessive clearance from wear the oil pressure will either drop a little or alot. Oil pressure will always be lower at idle than at higher rpms.

Last edited by EagleAutosports; 10-06-2007 at 10:53 PM.
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Unread 10-06-2007   #3 (permalink)
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Yes, try a new sending unit first, it's cheap and easy to replace. Do that before panicking.
Considering the mileage, the bearings have probably clearanced themselves and there will be some pressure drop. As long as there is some oil pressure at all times, you'll be fine. If it drops to zero at any time, then that's another matter.
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Unread 10-07-2007   #4 (permalink)
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Thanks for the help guys, I was getting a little worried.
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