Tremec Speedo Cable

Both ways are available.. The GM adapter for 7/8-18 works with the Mopar cable.. But it eats up space in a tight area..

https://americanpowertrain.com/shop...-for-tremec-t-5-tko-t-56-and-magnum-6-speeds/
And cables are available... Call Silver Sport, they have them, just not listed on their website... They are designed to use very little space...
https://www.shiftsst.com/speedometer-parts/c352