Rev Limiter

I have a stand-alone Jacobs, dash-mounted, dial back, Ignition timing box, and amp.......that has a rev-limiter in it. It is very simple to wire in and eliminated the Orange box. The dial-type rev-limiter is not particularly accurate, but for me it doesn't have to be, cuz I'm a streeter, and I set it more as a safety in case I blow a shift......which, the last time that happened was 2004. Then I fixed the daymn shifter once and for all-time.
Since it's adjustable, I sometimes use it as a cruize rpm limiter, so I don't end up speeding.
When I spend a night in a Motel. I set it to just above idle, and retard the timing.
Mine is circa 2000, and has never failed. I would sure miss it if it did.
There are other manufacturers building similar boxes.