vantage Posted January 4, 2010 Share Posted January 4, 2010 This is a small project i did last week to integrate the current driven stock tacho ("four wire tacho") of my '72 240Z with a new Megajolt ignition. The conversion enables the tacho to accept standard square wave tacho signals from electronic ignitions such as Megajolt, Megasquirt, Bosch, MSD etc. After a quick calibration the tacho was surprisingly quite precise (less than 3% error), not bad for a 38 year old instrument. Cost of material is below $10, time to build the circuit and install is 2-3 hours. http://www.dinoplex.org/tachoconversion/ Enjoy! Quote Link to comment Share on other sites More sharing options...
Konish Posted January 8, 2010 Share Posted January 8, 2010 Wow...dude that is a pretty cool project. Thanks for posting the pics too.. Quote Link to comment Share on other sites More sharing options...
vantage Posted January 8, 2010 Author Share Posted January 8, 2010 thank you Quote Link to comment Share on other sites More sharing options...
Bishopsrock Posted March 28, 2010 Share Posted March 28, 2010 (edited) Hi, This post is amazing and I know that a number of people on the RB forum will be very interested to see this. I am presently trying to adapt a a 280z tacho to work on a Nissan Rb26DETT engine fitted to my 240z. From your great write-up it seems that this would be a Kickback controlled tacho. The RB engine uses a Coil on Plug (COP) ignition system. I am using an Apexi Power Controller ECU and this has an output for the tacho signal but will not drive the tacho directly. Have you any advice as to how I might get this to work? Thanks in anticipation Edited March 28, 2010 by Bishopsrock Quote Link to comment Share on other sites More sharing options...
vantage Posted March 28, 2010 Author Share Posted March 28, 2010 It does look like a kickback controlled tacho. I have no experience with the 280Z tach, but the simplest approach probably would be to use a standard tacho adapter such as the MSD 8920 to convert the Apexi tach trigger to a compatible kickback ("voltage triggered") signal driving. Quote Link to comment Share on other sites More sharing options...
vantage Posted December 26, 2012 Author Share Posted December 26, 2012 I've updated the project to a full tacho circuit board replacement, so you don't need to have a programmer and software anymore to build this. The project is using the same link: http://www.dinoplex....achoconversion/ enjoy,Adrian Quote Link to comment Share on other sites More sharing options...
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