Toggle switch ignition. No keys, just toggle switches for accessories and ignition, and a push button for the start.
To bypass the ignition switch and go with a toggle switch/push button set up, do the following.
Two 25 amp toggle switches
Two inline fuse holders, I used 20 amp fuses
Any 5 amp momentary, normally open push button switch
Wire, terminal connectors, steering when puller, lock plate depresser tool, etc.
On my 1973 Blazer, the ignition switch had;
1 brown wire for accessories
1 pink wire to the distributor
1 purple wire to the starter solenoid
1 green wire, used to light dummy lights, not needed
*1 orange wire with a small brown wire with white stripe embedded in the switch with it for the heater/air conditioner
1 small gauge tan and white wire for ???, it's grounded so just ground it out, too.
2 red wires as 12v power.
For Acc toggle, connect orange wire, it's little partner, and the big brown wire together on one side, power on the other. Use one in line fuse holder on the power wire.
For ignition toggle, connect pink wire on one side, power on the other. Use the other in line fuse holder on the power wire.
For push button, connect purple wire on one side, power on the other. I ran my own power wire straight from the battery for the switch because the two from the ignition switch were used by the toggles.
*You may not have the orange wire/small brown wire with white strip bundle on your switch.