Lightspeed and MGL RDAC RPM issue

Anyone out there have a lightspeed ignition hooked up to an MGL RDAC that had issues getting an RPM signal to work? Everything else works fine from the RDAC, but RPM shows 0. I've checked with the ballast/jumpers removed, the signal seems to be there in the data line, and I've checked my display settings (Odyssey G2). Engine runs fine.

I've got a query out on the MGL user site too, but so far no leads.

Thanks,
Dwight