Another way to solve the problem s a data logger that hooks into the canbus via OBDII port.
I use on of these:
MoTeC > *NEW* CDL3 > Overview
with a whole bunch of alarms set that I can page thru - but then again, I am a dedicated track junkie and historic racer and one of the engineers who has done work on my race car is an accredited Motec dealer who supplies V8Suercar teams with wiring looms etc.
Complete overkill in respect of cost, BUT this is absolutely the ducks-guts for anyone serious about tracking their car as it is transportable between cars - just unplug from OBDII and the power source and move to the next car - I switch between my race car and the Z34 for track days. I have two files on my laptop reset the CDL3 between vehicles.
I don't trust the instruments in the panel and I like to see EXACTLY what the ECU is seeing
RB