This is a new, easy to install, direct replacement circuit board.
Brand new tachometer circuit board for 80's S-10.
Only American made, high quality components on my circuit boards. 
Direct replacement of the old circuit board that often fails or becomes inaccurate. 
This circuit board comes pre-calibrated, but includes fine adjustment ability if needed. -
Easy Installation, Just unplug your old tachometer chip and plug in the new circuit board. 
Lifetime Warranty, no hassle returns. 
Fast Shipping. 
       LIFETIME WARRANTY !!!