defi white boost gauge and any a/f gauges you have
for the defi white boost guage $146
and for the air fuel ratio from autometer your looking at $71
and for the auto meter your going to need the oxygen sensor to make it work properly and for that your looking at $103
i personally recommend the aem wide band guage it comes with evert thing needed for install for that your looking at $268
and for shipping on both these items your looking at $20