Tbi fuel only conversion

**stackz** · 03-15-2024

Originally Posted by dave w

I would keep the points distributor of the Mel 430 v8 and install a MSD 6AL Ignition System. ... http://documents.msdperformance.com/6201.pdf ... The '7747 requires a square wave reference pulse, which can be supplied by the MSD 6AL tachometer output. Using the MSD 6AL tachometer output eliminates the need for a GM Ignition Module to supply a square wave reference pulse to the '7747. ... dave w

found this thread while searching. which pin on the 7747 do you hook the tach output of the MSD unit to? I think its pin B5 (reference pin which is ppl/wht) but I havent seen it confirmed anywhere and this thread just happens to go directly into what I'm doing at current point in time. I already have a msd 6a hooked to my original points distributor. I want to confirm all the wiring/sensors/tbi unit work for fueling before I go to the trouble of locking out/modifying a hei distributor.

I'd rather troubleshoot one side at a time to keep variables to a minimum vs just doing everything at once and chasing my tail on both sides of fueling and timing...