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giac should have the tune 'off the shelf' for you given their work for iA. from what I can find out the resistor is required for the giac tune. if you go piggyback then the resistor is replaced by the piggyback unit. either way, as per jaay, you should want to keep an eye on things and monitor boost and afr. boost can vary due to failing sc, belt slippage, wrong sized pulley, etc., and if you are not getting the boost you have tuned for you might have problems.
for the two gauges, pedro sells a duel gauge plate for your dash, and autometer sell a dual pod for your steering wheel. egauges.com is a good place to shop for gauges, and plx sell digital ones that can display a lot of additional data.
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