Quick question regarding tach.

VMAX

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Joined
Aug 18, 2009
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I had a resister inline between the tach and tach sender for my 12valve before all the wiring got ripped out of the truck. Cant find the old resister. Any idea what size it should be? I think the truck was having problems with 12v straight to the sender and the resister fixed it i just have no clue where I got the info on what one to use.
 
Anyone? At what voltage should the tach sender operate at?
 
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