Sniper EFI and ignition type

No CD type ignition has a "coil trigger" appearance such as breaker points, stock Mopar ECU, or HEI on the coil NEG. On any CD, the coil NEG is grounded, and the coil PLUS receives the high voltage pulse from the CD. This is why conventional tachs won't work on CD CD ignitions operate quite differently from a Kettering or "switched" ignition

(I guess they/ you are thinking "inductive?" No, both are CD boxes)

I would think that you should be able to compare the wiring of this box to an MSD and devise a way to adapt it, might need a tach adapter

That is, this box and the more universal MSD all have the same basics...power-- trigger--and coil PLUS and coil NEG