No the HEX isn'tt new, only the program.
Pin 9 is still a extra output, you never know we can use him into the future.
I've to draw a better schematic, but I was in a hurry last night.....and it was late [&o]
X1 is a resonator, but you can use a cristal too but you need 2 extra capacitors to ground.
I'll draw this option into the final schematic and maybe I designe a PCB too for use with a cristal.
BT151 must be BA159 and R2 is connented to the MCLR of the PIC.
R3 and R14 are realy 33k, they have only make the gateline zero and unload the capacitor.
It's possible to connect Q 3 and 4 direct to the pic, but for safe (current) I use the BS170.
It's possible to run the Ignition from 6 Volt if you gone use a 5Volt lowdrop regulator.
If you gone use more then 8Volt, you can even run the ignition with a normal regulator.