SHADY280 Posted July 21, 2015 Share Posted July 21, 2015 Hey everyone I'm looking for ideas of how to get my stock tach working. My car is a 79 zx with na motor. I'm running 1fastz's ford coil setup and using a turbo dizzy as my optical trigger with DIY's disc. Also I have no edis on board as I'm using ms2 v3.57 modified with bip373 units instead (ecu mods by fricfrac aka Mackay power) so what I've tried is using Fidle and iac1 to trigger my stock tach. I go in and select these in tacho settings and then I'm trying to hook it to the old coil negative (blue wire). Do I need an adapter or have I missed something. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Metro Posted July 21, 2015 Share Posted July 21, 2015 You'll need to build a circuit to output the correct signal when using the tachoout and our old tachs. There's a few ways to do it, all listed on the MS Extra site. I'm using the coil method because I didn't want to rewire my coils. It's basically a transistor and a small relay with the switching part removed (so it doesn't click). Energizing the little coil in the relay outputs the same type of signal our tach are used to. The other popular method is to use diodes on the coilpack grounds, but I haven't personally tried it. Quote Link to comment Share on other sites More sharing options...
SHADY280 Posted July 21, 2015 Author Share Posted July 21, 2015 Ah got it. So I need to get the ecu opened up then and add some stuff. I'll have to give the ms extra site a read. Thx for the reply. There is so many ways and opinions out there it's hard to decifer which one I need Quote Link to comment Share on other sites More sharing options...
winstonusmc Posted July 22, 2015 Share Posted July 22, 2015 MSD does sell an off the shelf solution that I used before I switched ton a Maxima setup. Quote Link to comment Share on other sites More sharing options...
SHADY280 Posted July 22, 2015 Author Share Posted July 22, 2015 I do have an msd tach adapter sitting on the bench from when I had a regular distributor and msd 6a box. Would I hook it between the Fidle line and the tach line then?? Quote Link to comment Share on other sites More sharing options...
winstonusmc Posted July 23, 2015 Share Posted July 23, 2015 you do need to add some stuff in the proto area. I cheated and went MS3x, it has all the necesary hardware already installed. 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.