Reply To: Merc-o-tronic model 74-168 TM tachometer battery

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November 23, 2023 at 2:20 pm #282747
Steve Martin
Participant

    US Member

    Does a AA fit?  The holder looks longer.  If it fits, see if the ” Set” adjustment allows you to move the needle to the Set indicator.  If not it takes a higher voltage battery, perhaps an 18650.