Electronic ignition upgrade.

Yep, I bought a number of the LX101s (NOT the LX101T) a few years back, they supposedly don't have the rev limiter in them- not that any of my stuff gets wound out that high anymore anyways. But they've been rock-solid reliable without so much as a hiccup. They beat the heck out of all the knockoff orange boxes I've replaced. Can't say how they compare to the HiRev boxes, but that's sort of an apples-to-oranges thing anyway.
It's been said the Hi Rev 7500s are junk, but I've been running mine now for over a year without issue. Plus they are advertised as being made in the USA.