I recently finished swapping my 1997 Ford F-150 Lariat 4.6L to a 1998 5.4L, everything works okay so far. I'm planning to get it tuned soon so it runs as it should but it doesn't show any oil pressure or engine temperature. I took it to my mechanic and he said it was because the 5.4L measures oil temperature different than the 4.6L. I know it's just because the sensor is missing so I was wondering how I could install one? It isn't that big of a deal but something I'd like to have so I can keep an eye on my engine. Thanks!

 

If you look at the 4.6L you took out, where are the sensors?

The oil pressure will be an easy one. The coolant temp, not so much. I think the 5.4L might use a cylinder head temp sensor, while the 4.6L uses one in the intake manifold coolant runner.

 

I looked on the old 4.6 and it looks like both sensors are tapped into front base of the intake manifold right next to each other. I could be wrong at what these are but at the moment that's what it seems like. Could I tap the oil pressure sensor in from the 5.4 and then wire up the coolant temp sensor from the 5.4 into my 4.6 harness? (I used the 4.6 harness not the 5.4)

 

 

The oil pressure sensor should be on the driver's side of the block, towards the front.

The coolant temp sensor for the gauge should be one of the sensors on the coolant crossover on the intake. The other sensor, I think, is for the PCM.

 

I found the oil pressure sensor on the 4.6, I think I'm going to try and use the existing one of the 5.4 instead of tapping into the block. I also think I found the existing coolant temp sensor on the 5.4 so I'm going to try and rig that into my harness.