new gauges will not make much difference. i happen to have speedhut too-good stuff. bulkhead is a major component to wiring issues, but remember all the connections and wires are old. once you multiply all the minute components of ageing connections and wires with increased resistance etc. The thought briefly crossed my mind to disconnect the bulkhead connector and restore with a small file/brush/chemicals but with all things considered i decided to go all new and hopefully not need to experience problems in the near future. there are other things you can do for a healthier wiring/charging system such as using relays, etc. but the ammeter bypass and BH wiring are a major source of problems. me, i had the time and bought my kit on sale at the time so went that route. depends on the shape of you existing wire and connections. side note:i know when i pulled my wire tape off, the wires were like crispy ramen noodles. some people look at it real quick and say..."my wiring looks good"...but i recommend going deeper like unplugging things and peeling back the loom. some do many don't.