Autometer has a variety of Ultimate playback tachs. That was one of the best "tools" I ever bought. I learned a lot about where I was ACTUALLY staging, shifting and what was going on with converter flash, rpm drops, etc. They also have a driveshaft rpm sensor. Their latest - Ultimate DL, has O2 and pressure channels as well, all in one neat package. I believe a shift light is an option.

Autometer Ultimate DL tach

Autometer Ultimate DL tach YouTube intro.