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miloZ

Plug in stock tach and I lose spark

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Posted (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 by miloZ

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Posted (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 by miloZ

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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?

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