racepak v300, MSD 8913 tach adapter, MSD 89631 shift light, pro mag 44

Ran into a wiring issue trying to get a single MSD tach adapter to run 2 outpts. I've got an MSD 8918 clip on tach adapter.
http://www.msdignition.com/Products/...MR_Pickup.aspx


The tach adapter connects to the red wire between the pro mag points box and the coil.


I've got the output of the 8918 split to (2) 3 pin delphi connectors
- One for the Racepak 300 RPM trigger
- One for the MSD Shift light trigger


Problem is the shift light does not work with the racepak 300v RPM connector plugged in(racepak v300 can be on or off, doesn't matter).

If I unplug the 300v RPM pickup the shift light works fine and reads RPM.
If the racepak v300 tach wire is plugged up, the tach reads 0