LAST EDITED ON 28-Jun-01 AT 05:41 AM (PST)

The Tach Adaptors are required to stop the stock computer from setting ignition coil codes. The codes are mostly an annoyance, but if left alone for an extended period, these codes can begin to affect engine operation. The best bet is to put in the adaptors.

How do they work? Simple, really. When you install an ignition box like MSD or Crane, the stock wires that used to provide primary current to the coil(s) are now merely supplying a trigger signal to the box. The box, in turn, then drives the coil(s).

The stock computer senses that the current demands of the ignition circuit have now been sharply reduced (it takes far less current to provide a trigger signal to the new box than to drive the coils themselves). The clever stock computer interprets this as a coil problem, and set a code that turns on the Check Engine light.

What the Tach Adaptors do is basically provide a 'dummy' coil load to the stock ignition circuit, therefore increasing its current flow, and keeping the stock computer happy. They resemble small transformers, and wire across the stock ignition circuit just like the stock coil.

Bill Hahn Jr.
HRC

Bill Hahn Jr.
98 RS Turbo: 10.87 @ 136 MPH
HRC Stage V with N20
Nation's Fastest Street FWD 2G DSM
www.turbosystem.com