I would like to add a tach to my truck and I'm doing a little research first. Ole Caroline (as the kids have named her) is a 1951 3100 running a 1955 powerglide 235 with the column mounted 3 speed tranny and the stock 6 volt electrical system. I've never installed a tach before. Apparently I'll need a 6 volt/6 cylinder sending unit and a 6 volt tach? Also what tachometer rpm range would work best for this engine? Is a 5K tach high enough or should I look for something with a higher rpm guage. I would like to use an old or NOS tach so I will problably have to piece together the tach/sender and wire set.