I've run my LPF with a 5.5 in a 4wd on high grip stuff, no more of a test than that!
I think they are a fantastic speedo and you can really notice the adjustments (especially the DRRS = punch/throttle profile & AMTS = motor timing).
There is no need to get the PC interface etc. as others have said (it's about £40 if you really want it) as all the necessary adjustments are available of the included programing card
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