Tuning by EGT is very effective.
Tuning with blinky light can be effective but takes alot of time. It is best to use this for idle and part throttle cruise only.
The best tuning is done with a logged wideband signal. Without being able to log the signal it is no faster or better than a good EGT.
Best tuning tools I own are my peak hold egt and new generation g-tech. You can dasil it right in very quickly with these two onboard.
__________________
want a piece of the yellow car? (buy it)
you have to beat the blue car first
and then you have to take on the IV
my favorite quote
"if the solution is simple, God is answering"