OBD Apps versus Monitors/Gauges?

Most recent TDR article suggested OBD apps could "replace" monitors (much more inexpensively - wife kept happy..).
I purchase and installed the suggested ELM327 Android Bluetooth Scan "Tool" for Android and installed OBD Fusion on my Amazon Kindle versus Torque Pro.
Discovered OBD Fusion provided Boost Pressure but not Trans Temp or EGT and had "PIDs" for Ford and GM, but not Dodge.
Perhaps the Torque Pro APP would?
Any suggestions for an APP that would support Trans Temp and EGT for a 2005 Dodge RAM, or is my 2005 Ram 3500 truck and OBD info too limited?
Must I install Trans Temp and EGT sensors and use an expensive Monitor or Gauges?
Suggestions / Recommendations are appreciated!