GOTHALOSISM Posted May 25, 2011 Share Posted May 25, 2011 I searched and did not come up with a good answer. What resistor size do I need to get my tach to work correctly? Quote Link to comment Share on other sites More sharing options...
wheelman Posted May 25, 2011 Share Posted May 25, 2011 You have to experiment but start with a 4.7k. When I first installed my LT1 I placed the PCM in the front right corner of the engine bay, didn't have to place a resistor inline with the tach signal, then I moved the PCM to the passenger foot well and had to add a 4.7k to get it to work. Quote Link to comment Share on other sites More sharing options...
GOTHALOSISM Posted May 26, 2011 Author Share Posted May 26, 2011 Kool thanks for the info, wierd on why the placement of the pcm made a difference. Quote Link to comment Share on other sites More sharing options...
kamikaZeS30 Posted May 26, 2011 Share Posted May 26, 2011 Length/gauge of the wire would change resistance values, I believe. Quote Link to comment Share on other sites More sharing options...
wheelman Posted May 26, 2011 Share Posted May 26, 2011 Length/gauge of the wire would change resistance values, I believe. Thats exactly what happened. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.