BluDestiny Posted July 12, 2010 Share Posted July 12, 2010 I was trying to install an MSD 6AL unit and it was wired up fine for the MSD to work, but the tach isn't moving at all. It also has an upgraded coil(msd Blaster 3). Used this picture http://sethwissner.com/MSDwiring.jpg I know it has something to do with the Ballast resistor wires (the 3 wires that run into it) I just don't know what combination of them to use. Or do I need to get the tach adapter? I'm pretty sure I shouldn't need one because I've seen posts of 240z and 280z's not using a tach adapter. Quote Link to comment Share on other sites More sharing options...
Zmanco Posted July 13, 2010 Share Posted July 13, 2010 (edited) Or do I need to get the tach adapter? I'm pretty sure I shouldn't need one because I've seen posts of 240z and 280z's not using a tach adapter. If the car is a 71-73 then you need the tach adapter. The stock wiring triggers the tach off the negative side of the coil, but since the MSD fires the coil multiple times per ignition event at slow speeds, that will no longer work, hence the need for the tach adapter. Edit: just noticed you have a 260z which has a voltage triggered tach (the 71-73 are current triggered). I think you'll still need the adapter as the white trigger wire off the MSD box will probably not have a large enough voltage swing to trigger the factory tach. I'd still try it, but doubt it will work. Given the adapter is around $50, you might want to invest that money in a new tach instead which would trigger off the MSD box's white wire. Edited July 13, 2010 by Zmanco Quote Link to comment Share on other sites More sharing options...
280zbeeT Posted July 15, 2010 Share Posted July 15, 2010 hey buddy, I have the tach adapter you need. its a Tach adapter 8910, I was going to use it.. but now I dont have a MSD6a ITS still in the box, not even opened yet, I just ordered it offline, like 2 weeks ago, and now I have no reason for it, I ordered and payed $47 with shipping, its still in the box, never opened, original PERFECT condition packaging, comes with diagram and everything you need. its the only way to get your RPMS working.. I have a 75 280z with a turbo ZX engine.. thats why my tach adapters wouldn't have worked either.. I wish I still had the msd, but nope my deal didnt fall through let me know if you need the tach. I havent put it up for sale yet cus it just crossed my mind from your post haha. good luck man Quote Link to comment Share on other sites More sharing options...
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