garrycol Posted April 20, 2017 Share Posted April 20, 2017 How do I get a basic old style tacho to work with EDIS 8? Wire 2 (IIDM/Tach) on the EDIS 8 (does not work) and I have seen some wiring diagrams to build an interface module for EDIS 4 using diodes but I am not sure I follow it - they say to add extra diodes for EDIS 8 - has anyone a complete diagram of the EDIS 8 system with this module added. Googling the issue I did find one case of the PIP (wire 1) working but there is only one reference so am a bit wary of trying in case it causes an issue in the EDIS 8 module. I would appreciate any advice on getting the tach to work on EDIS 8. Thanks Garry Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 20, 2017 Share Posted April 20, 2017 Personally, I would get an rev counter that runs from the alternator, no issues at all there. Unless you have the MS relay block, the wiring for the 4-diode + 1 zener thing can get pretty untidy. Bonus is if the rev counter stops working, you know your alternator isn't charging, no matter what the charge lights says Quote Link to comment Share on other sites More sharing options...
zardos Posted April 20, 2017 Share Posted April 20, 2017 You could buy a tacho adapter like https://www.autosportlabs.com/product/tach-adapter/ This runs off the coil triggers of EDIS and basically merges the 4 separate coil firings in 1 coil fire signal that the original tacho is expecting. (You could build this yourself as it has a detailed schematic in the instructions) (Note I have not used this "wasted spark" tacho adaptor a my digidash happily runs of the pip signal) Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 20, 2017 Share Posted April 20, 2017 Oh, that does make it easier Still, a rev counter that works with alternator is probably a no-cost solution if you swap yours out for one that will work that way -perhaps yours already does with a dipswitch setting? I know I got an OE LR gauge working fine with an alternator feed... Quote Link to comment Share on other sites More sharing options...
garrycol Posted April 21, 2017 Author Share Posted April 21, 2017 (edited) Thanks for the Autosparkslab information - ouch just did the checkout thing - they want 5 times to cost of the item for shipping - not really viable. I will keep on looking. My alternator does not support a tacho so that is not an option for me. Thanks garry Edited April 21, 2017 by garrycol Quote Link to comment Share on other sites More sharing options...
Quagmire Posted April 21, 2017 Share Posted April 21, 2017 Usual way is either using a bunch of zener diodes, or using the guts of a relay: http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual.htm#tachoout Quote Link to comment Share on other sites More sharing options...
mickeyw Posted April 21, 2017 Share Posted April 21, 2017 3 hours ago, garrycol said: Thanks for the Autosparkslab information - ouch just did the checkout thing - they want 5 times to cost of the item for shipping - not really viable. I will keep on looking. All that item is is the diodes and resistors nicely packaged. I made my own with a bit of veroboard and through hole components. I based on the schematic on their installation page https://wiki.autosportlabs.com/TachAdapter Quote Link to comment Share on other sites More sharing options...
garrycol Posted April 21, 2017 Author Share Posted April 21, 2017 2 hours ago, Quagmire said: Usual way is either using a bunch of zener diodes, or using the guts of a relay: http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual.htm#tachoout Thanks but no MS fitted. Quote Link to comment Share on other sites More sharing options...
garrycol Posted April 21, 2017 Author Share Posted April 21, 2017 46 minutes ago, mickeyw said: All that item is is the diodes and resistors nicely packaged. I made my own with a bit of veroboard and through hole components. I based on the schematic on their installation page https://wiki.autosportlabs.com/TachAdapter Thanks but doesn't mean much to me - there is some sort of schematic there that is not readable Was hoping for some sort of diagram of something that connects to EDIS 8. Quote Link to comment Share on other sites More sharing options...
elbekko Posted April 21, 2017 Share Posted April 21, 2017 (edited) Seems fairly readable to me. Edited April 21, 2017 by elbekko Quote Link to comment Share on other sites More sharing options...
Quagmire Posted April 21, 2017 Share Posted April 21, 2017 You should be able to use the relay or diode method with the tach output (is it the IDM pin?) On the EDIS. Quote Link to comment Share on other sites More sharing options...
garrycol Posted April 21, 2017 Author Share Posted April 21, 2017 33 minutes ago, elbekko said: Seems fairly readable to me. Thanks for that - that is 1000% more readable than what was on that website - is not readable here at all. So I assume Coil 1 is A on the Edis Module - pin 8, Coil 2 is B on the Edis Module - pin 9 and so forth for coil 3 and coil 4. Thanks - makes things clearer. Garry Quote Link to comment Share on other sites More sharing options...
elbekko Posted April 21, 2017 Share Posted April 21, 2017 2 hours ago, garrycol said: Thanks for that - that is 1000% more readable than what was on that website - is not readable here at all. You needed to click the image to get the larger version. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 21, 2017 Share Posted April 21, 2017 And yup, abcd = 1234 As easy as.... Quote Link to comment Share on other sites More sharing options...
garrycol Posted April 21, 2017 Author Share Posted April 21, 2017 (edited) 2 hours ago, elbekko said: You needed to click the image to get the larger version. Hmmm tried that about 100 times and nope. But got it now so all is good - I hope. Edited April 21, 2017 by garrycol Quote Link to comment Share on other sites More sharing options...
zardos Posted April 21, 2017 Share Posted April 21, 2017 Clicking worked for me when I originally saw it and then I selected the "Original File" link underneath the image to get the larger version (Which takes you to https://wiki.autosportlabs.com/images/4/41/Tach_adapter_sch.png ) Quote Link to comment Share on other sites More sharing options...
garrycol Posted April 23, 2017 Author Share Posted April 23, 2017 I managed to buy some diodes and resistors yesterday and build the circuit. Not the prettiest as the holes on the circuit board were too far apart to bridge just with solder so had the be wired. I tried it this afternoon and the tacho sprang into life so all works well. Thanks for the contributions - great stuff. Garry Quote Link to comment Share on other sites More sharing options...
Chazza Posted April 23, 2017 Share Posted April 23, 2017 Nice one Garry! Where did you buy your components from? Cheers Charlie Quote Link to comment Share on other sites More sharing options...
garrycol Posted April 24, 2017 Author Share Posted April 24, 2017 Hi Charlie - cheap from Jaycar. The circuit board was a bit of an issue as I would have had to buy a kit with the etching and stuff so just got some board with holes in it but the holes were a bit too far to bridge with solder so bridged with the cut off wire ends off the diodes and resistors - not pretty but tested all up with the multimeter first and worked first go when plugged in. Cheers Garry Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 24, 2017 Share Posted April 24, 2017 Veroboard is ideal for that sort of thing... 1 Quote Link to comment Share on other sites More sharing options...
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