miloZ Posted March 13, 2020 Share Posted March 13, 2020 (edited) hello. I have a 73 240Z that I swapped an SBC into many years ago. did the JTR swap. Its got the HEI distributor. just now getting back to it. got it running good but when I go to plug in the tach I loose spark.... I had gone through the JTR steps to use the stock tach but it was a long time ago and now I cant find the swap book. I read hear that I need a 280Z tach to swap the guts and a resistor, (15k I read). I'd love any thoughts on the loss of spark. will this issue go away if I do the resistor and the 280 swap? Is there a better way to utilize the 240z stock tach vs swapping the guts? maybe a signal interface? or, is there an aftermarket tach that fits nicely into the stock location? Edited March 13, 2020 by miloZ Quote Link to comment Share on other sites More sharing options...
NewZed Posted March 13, 2020 Share Posted March 13, 2020 This might work, below. You'll still need to understand your wiring and which wires do what. But even if you get it to stay running it will probably read wrong, 8 cylinders instead of 6.. https://technoversions.com/ Quote Link to comment Share on other sites More sharing options...
miloZ Posted March 13, 2020 Author Share Posted March 13, 2020 (edited) NewZed, thats similar to the one I was looking at but the one you found is a little cheaper. thanks. https://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=1192/category_id=-1/mode=prod/prd1192.htm also found this one for $45 https://www.ebay.com/itm/UNIVERSAL-TACH-ADAPTER-CONVERTER-COP-1-2-3-4-5-6-8-10-cyl-to-any-4-6-8-Tach/141931549970?hash=item210bc79512:g:wqgAAOSwNX1b~MNz:rk:1:pf:0 seems like the simple solution to me. has anyone gone this route? thoughts? Edited March 13, 2020 by miloZ Quote Link to comment Share on other sites More sharing options...
NewZed Posted March 14, 2020 Share Posted March 14, 2020 I've never used any of these. I do know that the Technoversion guy's business has been around for years and people seem happy with his products. Read the instructions and you'll see that they're well-written, and he guarantees the product if you follow the instructions. That's all I know. Good luck. https://technoversions.com/TachMatchTM03InstructionManual.pdf? Quote Link to comment Share on other sites More sharing options...
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