Vacuum shift light

[Samtech]

Yep, that's exactly what I'm after. I'm not in the habit of ignoring lights either but think it might help.
Where my turbo starts falling off and where my over rev ends are two different thing when there's steep hills or flat lands (varied loads). If I could see when its time to shift or time to mash it would be better for me.
I tend to just stay mashed untill the rev light comes on but I've noticed the boost gauge will sometime start to drop off at the top which tells me to shift but I'd rather pick something up in my peripheral vision than look down at a gauge.
I think I'll look into a map/leader follow circuit. Good thinking, thank you.