Your meth injection,,,how is it controlled as far as ,,is it progressive,or does it just turn on & pump & spray the same @ all RPMs?

Is this a drag car the engine is in?
What trans,manual,automatic,,torque converter,rear axle ratio etc?
this motor is in a street car which has recently become a daily driver ( due to a deer hit in my other car) it has a th350 trans with a shift kit and a 1800 stall converter( i know i need more stall) i dont know the rear gear raito it is a stock 67 chevy ii 6 cylinder rear (probally wont last long) as for the water/meth injection it has a progressive controller it kicks in at 2300 rpm and 4 vacuum and the spray gets stronger untill 1 vacuum. i looked in my owners manual for my carb and i cant read that chart to pick my jets and rods. i feel like i should know this stuff.