scottyMIz Posted July 19, 2004 Share Posted July 19, 2004 hey guys i have a haltech in my car now with coil packs and can't run the stock tach.I have a 240 tach and was told they are current sensing and the 280 is voltage sensing.How is the 240 tach hooked up does the power for the coil packs run thru the tach(usually how amperage is measured)?I searched and didn't find anything on this subject. Quote Link to comment Share on other sites More sharing options...
Guest mkokimoto Posted July 21, 2004 Share Posted July 21, 2004 How about getting another tach with the same sweep, gutting both tachs and putting the new tach in the old enclosure, for that "stock" appearance? Quote Link to comment Share on other sites More sharing options...
scottyMIz Posted July 21, 2004 Author Share Posted July 21, 2004 i could but i found out i think how to wire this thing the power runs thru a 240 tach to the coils and then for the 280 it just samples the power. Quote Link to comment Share on other sites More sharing options...
Clifton Posted July 25, 2004 Share Posted July 25, 2004 http://www.dakotadigital.com/products.cfm/-/Category=122/category122.htm and MSD both make tach adapters. I couldn't get my 240 tach to work on my 7M swap(factory coil packs). I used the Supra guts as I already had it, in the 240 tach body. If you find an easier way please post it. Quote Link to comment Share on other sites More sharing options...
srgunz Posted July 30, 2004 Share Posted July 30, 2004 Never had a 280Z but on the 240 the power comes from the ign sw. to the tachometer then out to the coil positive. The power runs thru a core and coil set up on back that inducts a pulse to trigger the tach. That is about all I can help with. Quote Link to comment Share on other sites More sharing options...
scottyMIz Posted July 30, 2004 Author Share Posted July 30, 2004 that is what i found out and the 280 just samples the voltage and looks for drops.Maybe this weekend i'll get time to try and swap the tach's out and see if it works. Quote Link to comment Share on other sites More sharing options...
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