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It's not cheap, mainly because it's an "all-in-one" - playback tach, pressure and A/F, but I recently ordered the Autometer 6894 DL tach and related stuff and can't wait to put it to good use. Their regular playback tach was one of the most useful "tools" I ever got. But having this all-in-one deal should help tuning quite a bit. Just have to read the instructions & learn how it make it all work.

Autometer DL 6894 tach @ Summit




Wow cool tach! Didn't know they made that.


Brett Miller W9 cnc'd heads
STR Chassis fabraction