Bypassing the Amp gauge - Question about the MAD Electrical method

The last time the PO had it running was just over 2 years ago, it has sat ever since, he was battling cancer and lost. I'm not sure what all he did to it but I'm slowly figuring it out.
I'm thinking the tach switch was just for the lights? I am fine with relocating it but I have to have it. I agree with you about using the ignition switch and relay the way they were designed to be used from the factory. Seems it would be less complicated.
I will need a cut-off switch since the battery is in the trunk per NHRA rules.