brand new one is new from the box unused...where else...2nd hand used before...risk of faulty one....obviously...u save more with 2nd hand la.....for me gauges that we depend on like speedometer, petrol & radiator...better not play play....rpm normally for the sake of tuning the idling and to know at which rpm to change gear only.....well is up to you la...some things we can try to save but some things better use new parts.....if you are going to use the car for sometime.....btw which meter not working?? i changed my temp & fuel gauge...about 130 with installation....