I'm not knowledgeable with electronics, but had the 103T Directed Electronics mini keypad starter kill installed ten years ago on my rig (just for carjack prevention when kids came along). $120 all in with install, still going strong. I can leave keys in ignition with radio on, but won't crank without 4 digit code, horn blares. Probably easy to bypass if you have a few minutes, but it has provided peace of mind over the years and it's small and quick. It's like other necessities, never needed it yet, but when I do, glad I have it.