We are a dead breed ,lol.I have told many that i set the timing on my race car by reading the plugs ,and they always tell me your gunna burn the pistons with too much advance ,since i dont know how much timing im running not using a lite ,and how they would never make a pass in a car that they didnt know how much timing was in it.At nearly 200 passes on the motor im still waiting for the burnt pistons.Usually the guys that tell me this have a car that pings going down the track ,or is lacking timing and runs slower than it should ,lol.I adjust valves by feel and carbs by ear also .Vacume gauges to set carbs are for newbies .Plugs will tell you everything about a tune .I set the fuel pressure up and up until it tries to over power the needle and seat ,then back off 1/2 psi on race motors.I run a gauge on mine just to makes sure it never changes .Im running 8 1/2 psi on my 750 Demon ...