i have just changed my 1990 ea s pac from a 4sp auto to a t5 manual and now i have now reverse lights or speed,the harness from the manual had an 8 pin plug and a single pin plug,8 pin plugged in and it started but the is no plug for the single pin.What is the single pin for?would the speedo sensor be part of the big round plug for the auto as there was the 8 pin and a round one with 10 pins or so i think,any help to get my speedo working at least greatly appreciated,

it shouldnt be too hard to work out have a look at your old 4 spd loom and there shoulbe 3 sets of plugs small one with 3 wires go too the speed sensor the square one has 4 wires 2 are for neutral switch other 2 are reverse .compare them u should be able too sort it