for referance my tank is 1.6mm ally so i would have thought anything around 1mm steel would be fine, dont forget to put in a couple of baffles but if you are using a laver arm sender make sure you leve enough room for it to move and if you are using an in tank pump its worth mounting a thicker plate onto the bottom of the take so when you bolt,/riv nut etc it does not deform the bottom of the tank like mine did....oops
hope this helps
tilly
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