Redarc Gauges, Watchdog, Saver, Guard. What have yougot? Pics

[Jhooper]

Hey guys I've just got my NJ 4m40 back on the road
Now I need to make sure it doesn't crack a head again!
What have you installed to monitor engine/coolant temps/levels - theres alot of options...

Redarc gauge G52-BET - boost, egt, temp $380
VDO gauge - EGT sensor pre or post turbo
Engine Watchdog - bolt-on sensor and alarm
Engine Saver - inline low coolant alarm
Engine Guard... Guardian... the list goes on