at the moment i have a mixture of gauges in my cars.
Defi, Racetech, Mocal, Auto meter, Sec's monitor.
All accurate (all been tested), but the Defi is simply the best, for looks and features.
In my cossie i run,
Racetech and auto meter Boost's, Auto meter rev counter, Racetech oil temp and pressure, Defi EGT, Tech edge AFR, Racetech fuel pressure. and a Sec's ECU monitor.
Xr2tt i run,
Mocal Boost, Oil temp and pressure, Auto meter EGT, AFR, and ACT's. and i fit a coolant gauge for trackdays.