digital cluster on 4agze coil packs??

[KameleonK]

ok so am running the ae101 4agze coil packs on my 20v and i have a tach adapter so it can read it correctly to my cluster...but somehow it still doesnt read it right and was wondering if anyone had any idea of what i could do so my tach can read the rpms correctly

i have a digital cluster on my ae86
and i have this tach apater
http://www.summitracing.com/parts/ATM-9117/?rtype=10

now supposedly it should work since i had the the wiring profesionally done but still fails to read correctly the tach

i also saw on club4ag that if i change the resistors in the cluster it will fix the problem but i have a digital cluster so the board inside is a little more complex so i cant change what i need to..... so i dont know what im lookin for

any help would be great