okay, does ur meter feture two ball valves, and a pressure gauge between these two valves?? - between the propane and the first ball valve there should be a regulator. make sure its setup liek that. Instead of going and confusing urself try this solution, inject 2psi increments into the chamber, and try to ingite. so first u inject 2psi worth, try to ingite, if it doesnt ignite, inject another 2psi, once u get igniton, remember how many injections u did, say it took 8 injections, now u know thats the same as injecting 16psi worth, so then u have a rough idea of what is a suitable mixture, the next step is going slightly higher and lower, keep changing it till u have good instant ignition, and make sure there is minimal smoke left after combustion. now to be perfect once u have ur ball park figure go back to the books and have a play, atleast ull have ur gun working. I love maths its just too late for me lol, so tired
![Sad :(](./images/smilies/icon_e_sad.png)
remember if ur gonna use numbers and get the perfect setup, ur meter volume and chamber volume calculations need to be spot on also
The gauge is reading something when u inject because u just injected in a shot of gas (slightly presurising the chamber), just add the same amount each time regardless.