always good to have those temp. gauge in case of pump failure, you might able to shut the engine before its too late.
easier way is to get a digital OBDII scanner/gauge, just plug it in to your OBDII port and thats it. no need unscrew anything.
N51- Perfomance Intake - Performance Exhaust - ESS Tuned - Performance SSK - CDV Delete - AFE-Header