how many ohms do i need

[schpeen]

I am running with the original gas tank behind the seat. I am running all new gauges not the stock cluster but the sending unit I got is for the tank mounted under the bed

should I try to find a sending unit to run the new gauge with the stand up tank

or maybe a new gauge that runs same ohms as the stock sending unit I have ???

no computers I have a 350 chevy with a holly 660 and 700R4

any advice would be appreciated