SAR sell in Jan 1999 was at about COMP 2320. The buy back was at around COMP 2480. That sell signal resulted in a loss.
Another signal in May was good for maybe 80points until the June buy, a sell signal in June lost about 150-points, a sell in July made maybe 100 points, as sell in September lost 100-points, a sell in December lost about 300-points, a sell in the end of January resulted in a loss of about 450-points.
Added up, you've got about 180-points in gains, 1160-points in losses. Your indicator resulted in a net loss of almost 1000 COMP points over 13-months in a bull market. You lose 6-times as much as you gain with this indicator in 1999.
I do not know anyone who uses this for anything other than a snap-shot showing the current trend.
BTW, I just noticed the COMP is currently just under the monthly 20-EMA at 1605: