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I am totally confused.

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get a push button that is used to start tractors or gennies, wire it in parallel to the starter wiring and you wont need to cycle the key to reset the mechanical interlock in the tumbler housing.

I don't think I've done a good job at explaining what I'm looking to do. At the risk of muddying the waters further, let me take another crack.

The stock functionality of the ignition key switch is to allow only start attempt per key cycle. The purpose is to prevent inadvertently engaging the starter with the engine running. Inserting the key and moving it to the RUN position and then on to the START position engages a mechanical lock-out that prevents another attempt to engage the starter without first going all the way back to the OFF position. All I want to do is mod the switch to be able to eliminate the lockout function so as to be able to go from RUN to START many times without returning to OFF.

I know I can add a manual start button to accomplish this, but my goal, and the point of the question was to see if a mod could be accomplished to eliminate the lockout feature of the switch.

That's what I'm trying to avoid, if possible.

yep paid more attention today and probably starter button or have to see if you can modify the switch.

have an idea for the arduino setup you were working on. preglow the glow plugs for 2 minutes when you open the drivers door, once the car has reached operating temp, or is warmer than is needed to start the motor have it lock out the function, so it doesn't start a cycle when you get out of the car. by the time you get in put your sear belt on and turn the key the car should be ready to start.

I use a manual glow switch. 3-4 seconds, hit the starter and I'm off. If it's really cold (SoCal standards) 7-8 seconds. By glowing only what I need, the plugs should last for a long, long time.

Well looks like it's not easily possible to disable the lockout function on the switch. I opened up the switch and took it apart. I couldn't find an obvious component that did the lockout. I put it back together without the steering lock pin to test and couldn't get it apart again. I suspect I've got the tumbler in 180 degrees out and it won't turn enough to get the tumbler out again.

Any thought of using the spare 123 ignition module as a spare is now history.

Can you use a large capacitor in the power supply line for the Ardunio board to allow for continuous operation while you cycle the key?

This would work but may not be practical depending how much power the Arduino draws and how long power needs to be hold up. If it's a few seconds yes but if it's 15 minutes no unless you want a capacitor the size of your car battery and not cheap. My suggestion earlier running it directly off the battery via a toggle switcg will solve his problem.

I think it would be easier to route the power to the gauges through a separate switch.