Cheapest and easiest to set up is an MSD or Autometer shift light module. Just hook it up to the tach diagnostic plug (green plug w/ two white wires) located on the driver side engine harness near the A/C compressor and run it to a super bright LED you can place anywhere. For a few dollars more you can get one of the mini 2 1/16" LED tachs w/ built in shift light. Easy hook up and since it's small you can mount it anywhere. Email me and I can set you up with what you're looking for.