i have a 59 235 truck engine that soon will becoming home from being rebuilt. this enine will be replacing the original 235 splash in the 51 dump. ive gotton most or know where to get the parts to have a complete running engine prior to putting it in the truck come spring. i need to upgrade the oil pressure gage from 0-30 to 0-60. is the oil gage in the cluster replaceable or do i need to replace the whole cluster with a later cluster. i know on my 40 i can get seperate replacements.