85LSburb

iTrader: (1)

I have a quick question. How many of you have a tach hooked up to the msd box and what setting do you have it set on 4,6,8 mode. Mine is set on 4 or 6. I want to buy fast ez efi for it and need a clean v8 rpm signal for it to work right. Just making sure it is my tach that is messing up not my box. I called msd and the guy on the phone says it puts out a 12v square wave v8 signal. And i have to have my tach set on something other then 8 and it is brand new. Thanks.

ZONES89RS

iTrader: (25)

The MSD box is st for a 8 cyl pickup, both of mine are on 8 cyl mode. One is a 6010 and the other a 6012.

85LSburb

iTrader: (1)

Hmm Cause i am almost sure i had to set my tach on 4 or 6 mode to read right....well the closest. It is still a little off but not much. Thanks that make 3 tachs that work on v8 mode and one (mine) that does not. Which is compleat bs cause it is brand spankin new.

ZONES89RS

iTrader: (25)

The one on my 6.0 reads slow though, cannot keep up with the RPM.

85LSburb

iTrader: (1)

Mine was like half speed of the engine or twice dont remember now. But now it is a little off. I called msd and they sayed it puts out a square wave and maybe the tach can not read it good.

Pop N Wood

iTrader: (1)

My tach has an adjustment screw on the back. I was able to dial it in by reading the RPM on the MSD software.

It is too slow also. I usually hit the rev limiter as the stock tach is still climbing