geo, i have a defi egt gauge, i like it, takes about 5 mins to get going, but they all take a while to 'warm up' (no pun intended) and as for AFR. i have the NGK one, its a bit bulky, but i know youre one for function not looks. it works well and only needs calibrating about once a month and it only takes 5 mins. hit me up on msn if you want to chat about it matey.