SR Tach Problem

[808DRFTR]

Hey guys wondering if anyone has the same problems as I do. I have a Redtop SR in my '91 Which has the dohc cluster in it duh! Well my tach does not want to work. I've tried another DOHC cluster and even an JDM cluster both do not work I just recently picked up another JDM cluster to see what will happen and still nothing. Also had an autometer hooked up to the tach wire and it worked fine, just don't want no gauges all over the dash and pillar

Ohmed the cluster to ecu for tach wiring and everythings good there 0.2 Ohms. Also checked all fuses and grounds....anyone can help that'll be great, Thanks