There is also a built in Thermometer that those 4-bars (bar graph) works with - it might give you an idea as to the dynamic rise and fall of the engine coolant temperature as you drive, then stop and idle or slowly move along in traffic.
IF you are aware - there is a HEC test mode.
PDF to do it is attached.
When you're parked, try to do a practice set of runs and uses with it before you start to drive - so this several times so you're comfortable with the display information.
As you use the HEC, the POD consoles Analog gauges works normally unless it's in the GAUGE setting - so if you just want to see the TEMP or the Throttle or even RPM - you can set this mode then just drive to see the comparison to LOGIC to the Analog POD display gauges.
You don't have the upper info display like you'd normally see - so the HEC is a rather power tool but don't let it get in your way of driving - you can use it to help understand the gauges, Fuel - Throttle and temperature of the sensor reading.
The HEC can help offset the desire to find another gauge that although is nice to have - forces you into a position of having to install something you may not need the use of later once you're done with the diagnostic of temperature