Kenwood TR-7400a cable

I have a Kenwood TR-7400a that I’m wanting to hook a digirig mobile to. I have searched and can not find an existing cable that will work for this. Anyone have any suggestions? Thank you.

looks like you’ll have to homebrew

4 pin mic plug on the front and a mono 1/8" on the side of the rig.

good luck
kb0wlf