I agree with bartamos - no diode is necessary and idiot light is optional.

The idiot light is kinda nice to have so I'm thinking about adding one. This looks likes the correct vintage for the truck. https://www.tubesandmore.com/products/jewel-fender-style-lamps-bulbs


Gord 🇨🇦
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1954 1/2 ton 235 4 speed