[V8] oil temp and press senders

[brat boy]

hey guys I'm getting my car ready for my inspection and I'm ofcourse panicking. The pol tell and press gauges are wacked. Who,e driving the needles are way over to the far right and in neutral the pressure gauge does a crazy erratic dance in the  Middleton the gauge. 

I called with d and some say the sensor for the pressure is a couple of bucks. Someone else says there are two, one blue, one red, and another comes Sith the gauge for a hefty price. Nobody has the temperature sender.

I also do t even know where the senders are on the engine. Can anybody let me know where the senders are and what I should be buying? Does the pressure unit do temperature as well?