You probably need the cable from a TW400, which originally came with the Honda engine that Predator engine is a copy of. I had a TW400, and swapped that engine in a couple times over a 8 years. Rode hard, put away wet. Keep the air filters clean, we usually ended up dusting the engine and no compression.
Here’s the link to the manual:
part 131 in the parts schematic.
https://landmaster-assets.american-landmaster.workers.dev/uploads/manuals/UTV/TW400-390cc-Honda.pdf
also, there are several parts that I swapped over from the Honda, like the 10 amp charge coil and the 4 magnet flywheel. I also swapped the intake elbow and air cleaner, and engine wiring harness, since it matched up to the TW400. Not sure how it would work in the TW450.
heres the honda parts I saved in an amazon wishlist years ago, so I would have them if needed. I did not buy from amazon usually, direct from Honda was usually cheapest, FWIW.
Honda 90634-ZL8-H00 Cap Sealing
Honda 17235-Z5T-800 Nos
Honda 17417-Z5T-000 Gasket, Air Cleaner Hsg
Honda 17210-ZE3-010 Element Air Cleaner
Honda 17410-Z5T-000 Elbow Complete, Air Cleaner
Honda 32110-Z5K-810 Wire Harness, Engine
Honda 31630-ZE2-861 Coil Charge (10A)
Honda 31110-Z5T-840 Flywheel (Sel-4Pole)