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Wasn't particularly obvious to me either, but Satch's question is still valid since the color rendering of the pic is marginal. Is the small wire Y/R or Y/O? And S4/S5? or even better, year of TII (or JSPEC engine swap?)
sorry, i'm mainly trying to find the O2 wire, is it a thick grey wire? only see one and my o2 isnt hooked up its the fat wire that looks orange in the pic.