Replaced factory cluster w aftermarket. Turn signal issues

71 Demon.

Replaced the stock (standard) cluster with auto meter gauges. Now I am having turn signal issues that were not present before.

With headlight switch off. Blinkers do work but are slooooowww. Indicator lights work at that same speed. Flashers and dash indicators work as they should.

With the headlight switch on, both indicator lights activate. No blinking function at all with either side turn signal. Indicator lights brighten along with tail light on the side that is activated though. Again, flashers seem to work as normal.

Anyone ran into this before? If so where should I start to track this down?

Thanks and Merry Christmas.