Granted a set of Defi gauges is expensive too. These do have a nice feature that the voltmeter works as a turbo timer. But for that price it'd be nice if you could datalog.
"The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art. There is no color that doesn't suit it. There is no mood-lifting chemical substance it can't replace." - Automobile Magazine