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HARTZELL MODEL D-4390 VU-THRU TACHOMETER

COMES WITH A PLASTIC CASE, CALIBRATION WRENCH, AC  POWER PACK,

INSTRUCTIONS AND CORDS

WHEN PLUGGED IN THE TACHOMETER GAVE A 0 0 0 0  READING.

I HAVE NO WAY TO TEST THIS ITEM SO I AM SELLING IT FOR PARTS OR REPAIR

THE TACHOMETER ITSELF IS CLEAN WITH SMALL SIGNS OF USE, NO BROKEN

OR DAMAGED PARTS SEEN ON THE OUTSIDE.