can use your old tank with mk2 lift & main pump + lines. if it was me I'd fit a k-jet main pump for safety but peeps have used the digifant one on lower power applications. MK3 tank + pump would also fit, again if me I'd go with the VR6 pump for safety.
other options include some kind of aftermarket pump+filter under the car, in this scenario I'd put in a mk2 lift pump + a fuel reservoir to prevent fuel starvation. Could go all out with custom fuel cell if you like, your call.
dash is up to you, need a rev counter converter if you want to run rev counter in your old clocks, or fit a seperate one as you say. Another thing to consider is if you have a later engine with the immobiliser built into the clocks, if so you either need to fit the clocks, have immob defeat or go aftermarket management.
