IHC Tac problem

Roadsend

New User
I was given my Dad?s old 1980 model IH 484. The tac stop working and I determined the tac itself was bad. The original part number is 3121926R91. Could not find that part so I ordered part number 3125106R92. This is a new tac and was offered as a direct replacement for International Tractor 454 464 484 574 674 etc. Installed it and it will only read 1500 rpm at full throttle. Is the tac itself adjustable so it will read correctly?
 
Cheap chinese tach. Send your original to Star Speedometer, Palm Coast Fl. 32164 Ph.# 386-569-5284 and have it rebuilt.
 
If the engine obviously goes beyond the indicated RPM, do as Mark-IA suggests. If in doubt, use a strobe tach on the front pulley to assess the true RPM. Jim
 

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