Am not an expert but suspect you won’t need one - suspect you’re not trialling? I fitted a couple of these when I trialled a few years back but that was on a carb and essentially, ensured throttle closed in event of any issue. To put in context, at the same time I fitted I was also ensuring my roll cage and so on, were compliant.
Think you’ll be ok but dependant on event type, I suspect.
Alan.