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I found the answer I needed deep within the archives of the search function (forums.tccoa.com/showthread.php?t=463), but it stands to be mentioned possibly chronicled somewhere else as well that the oil pressure sensor/switch is different between the 94-96 and the 97 or more simply put for those swapping motors from PI engines or mark 8's there is a difference between the sender for a vehicle with a low oil pressure light (97 thunderbird/93-98 mark viii) and a vehicle with gauge (even though it's a dummy gauge). Just something I had long forgotten and freshly needed to know. If this is already well known then mods feel free to delete this thread.
 

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IIRC, the wrong sensor will show full oil pressure with KOEoff, then disappear when you start it.


Is all this in the wiring to the 97 dash cluster, and a cluster swap will fix it? Or is the 97 dash harness different?
 

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I just reread this, And realized my 97 only has a Light.
D'oh!

This will only be important if I swap clusters.

I do really hate the 97 cluster, and key.
 

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If the sensor measures shorted on the bench, it will be correct for the 97 + MarkVIII; open will be for earlier cars.

Both are switches; but one is Normally Open and one is Normally Closed. :)

They flip to the opposite state on oil pressure; ~5-10psi.

If these freak out, hope it's a wiring problem; it's too late otherwise, lol.

Thinking about this, our circuit is: a short on pressure to ground, thru a 20 ohm resistor, thru the gauge.

If our <= '96 sensor shorts to the manifold (ground), there should be no change. An open is required to cause a gauge problem.

A 97 or Mark shorts to ground, the light comes on; BUT An open wire only shows on startup KOEO lamps. :) Maybe the eec is designed to look, IDK.


I was surprised to find this out about the 97 cars; I hadn't read that before.

The changes make sense; they actually made a 98 Mark. :)

Our promised '98 SC 4.6 would likely have had this switch as well. :D
 
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