RPM activated retard w/MSD6al

I'm trying to get the components to hook up a rpm activated switch to retard my timing on a naturally aspirated 340.I talked to MSD and they suggested a 8987 which I don't see any rpm activation. I think what I need is a 8950 switch with a 8676 retard but I'm not sure if they are compatible. May need to talk with them some more. Any suggestions? Thanks in advance.

Check out MSD 8970 - 3 step timing retard. with 8950 RPM switch.

https://www.jegs.com/InstallationInstructions/100/121/121-8970.pdf
Figure 11 on page 6 shows rpm switch connection to the 8970.

The 8970 is a good unit both for start retard as well as retarding for Nitrous.
Mike

Not sure what the"upgrades" will cost,but the MSD 6al-2 is laptop programmable.You make your own curve with ability to change timing every 100 rpm.

https://www.holley.com/products/ignition/ignition_boxes/street_and_strip/parts/6530

looks like this one would work. MSD 8987.Start & one step retard.

https://documents.holley.com/8987.pdf