Does anyone know how many pulses a 1993 fj80 tach uses. I ask b/c it could be 2, 4 or 6. Probably 6. Some oem tachs use 4. Installing 2006 6.0. GM PCM can be programmed to 2,4,6 or 8 pulses. So if I set it to 6, maybe just maybe I won't have to replace tach or remove dashboard. I'm an...