hey mate, i just finished doing the saame conversion about 4 weeks ago, these guys pretty much covered it, you will need to pull the temp sender out of the rb30 and putit into the rb20det, and same with the speed sensor that screws into the side of the gearbox. as for the tacho, you need to run a seperate 12v inpput onto the line with a 10kohm .5 watt resistor between the 12v and tacho signal wire. beasides that i used the alternator air con pumps off the rb30, they bolt straight on, its all pretty much bolt straight on stuff, also your turbo dump wont exactly fit you zorst so u may need a custom peice made up, i used a rb25 zorst between turbo and cat and it fit really well. besaides that its pretty easy. good luck, any other quest, let me know.