In-cab to under-bed fuel tank conversion questions

[Xavier]

I've been collecting the parts to do an EFI upgrade on my '68 and was looking for some insight from other regarding fuel tank options.

I already have and plan on using a Holley Sniper EFI with a Holley in-tank Retrofit fuel pump module.

Using that setup I think I will still need a sending unit to get fuel levels, correct?

There are so many different tank options I'm not sure which would be best suited for my application. I definitely want a side filling tank.