Nissan Repair: frontier oil pressure + heater issue, oil pressure gauge, oil pressure sending unit

Question
Hi, My '05 frontier 6cyl oil pressure gauge us is pegged high.  Also the heater blows cold, but may blow hot if I play with it.  I suspect the oil sending unit is bad but can these two things be related?

Thanks.

Answer
James,

The oil pressure sending unit is the most probable issue with the oil pressure gauge.  Replace the sender.

The heater sounds like the control or the motor that runs the blend door is going out.  Pull the glovebox and figure out if the blend door is moving and if anything is sticking.  If all is well under the dash then you are looking at a control panel replacement.