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Check the upper radiator hose connection where it joins the thermostat housing. They can leak here and be pretty hard to detect.
Have you asked them to specifically look for a coolant leak? Depending on your warranty start date, you may be nearing the end of your warranty or it may already be over. I'd get it checked right away.
There isn't an oil pressure sending unit per se on your engine. It is more of a "Yes I have oil pressure" or "No I don't have oil pressure" switch to inform the driver in the message center with a GREEN LIGHT that there's low oil pressure. Smart idea, picking green. Oh, the oil light is on, but it's green, so it must be good!
I have used a 135* elbow and adapter to add an oil pressure gauge to a customer's truck. It's not fun to do, given the working area, but it can be done.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.