hi tabetha, thanks for the reply iv been and got 2x 1n4004 diodes from maplin as been instructed before and wired as you described, but still no joy, and the rpm count is all over the place , however if i join 1 of the outer wires from coilpack to rpm counter wire it seams i get a good half reading,? i will pass maplins tomorrow and get the diodes you say and try again. thanks again for the advice.