I'm using the MSD dist. that doesn't use a box, supposed to be built in, can't remember the number. Have tach wire to coil. It worked fine until I found out I had the alt. wire hooked up to the wrong side of the solenoid I ended up changing starter, and solenoid at same time. I have fuel pump wire and cooling fan for tranny getting power from the hot side of solenoid. Also have power to CSI starter from this lug. I shut off pump and disconnected cooler wire but still same thing. I'm wondering if I could have F*%$#d it up when I had the alt. wire wrong. Fuse block is crusty and I'm thinking of running tach power from hot lug as well or hooking up a lug seperately to run accessories and just having stock wires on solenoid