240zprace Posted April 28, 2008 Share Posted April 28, 2008 is there a easy way to modify stock tach with work with LS1 motor ecm? my project starts soon...THANKS Quote Link to comment Share on other sites More sharing options...
Blown77Z Posted April 28, 2008 Share Posted April 28, 2008 Send it to JCI... Quote Link to comment Share on other sites More sharing options...
m1noel Posted April 28, 2008 Share Posted April 28, 2008 Send it to JCI... Yep, that is the easy way, they know what they are doing. Mike Quote Link to comment Share on other sites More sharing options...
rwwisnesky Posted April 28, 2008 Share Posted April 28, 2008 Interesting, I sent mine to JCI and it works. However, when i punch it, it goes wild. Guess i will just have to live with it!! Even if I could have it fixed, not sure it is worth pulling the dash again to get it done. Quote Link to comment Share on other sites More sharing options...
zed240au Posted April 29, 2008 Share Posted April 29, 2008 hi not sure if it will work but ive already had my tacho converted to suit v8 from previous v8 install have got guy who did wiring loom mods to give me signal wire for tacho so hopefully that will work its in the jtr book how to convert tacho to v8 just add resistor from memory if all goes well (and it isnt at the moment got engine wired and ready to start last weekend but it cranked built up fuel pressure, plugs sparked but injectors not firing have traced fault talking to guy who modified loom has told me how to solve at moment but working away)so fingers crossed will here it run for first time this weekend and i can tell u then if tacho works mick Quote Link to comment Share on other sites More sharing options...
240zprace Posted April 29, 2008 Author Share Posted April 29, 2008 i know JCI can do it, but was trying to DO IT YOUSELF thing... Quote Link to comment Share on other sites More sharing options...
Cable Posted June 28, 2009 Share Posted June 28, 2009 So what did you end up doing? Quote Link to comment Share on other sites More sharing options...
240zprace Posted June 28, 2009 Author Share Posted June 28, 2009 So what did you end up doing? hi cable, i ended up sending it to JCI Quote Link to comment Share on other sites More sharing options...
Cable Posted June 28, 2009 Share Posted June 28, 2009 hi cable,i ended up sending it to JCI Cool, what did you use for a speedo? Quote Link to comment Share on other sites More sharing options...
240zprace Posted June 28, 2009 Author Share Posted June 28, 2009 Cool, what did you use for a speedo? got a speedo converter box from JCI as well. Quote Link to comment Share on other sites More sharing options...
Cable Posted June 28, 2009 Share Posted June 28, 2009 got a speedo converter box from JCI as well. Cool deal. I bought another Z and want to keep the interior looking mostly stock this time around. Quote Link to comment Share on other sites More sharing options...
chris51881 Posted June 28, 2009 Share Posted June 28, 2009 i had the same ? on my build and dts300z sent me this: >>I posted the information below to help the other guys out with wiring in the factory gauges. Quote: Originally Posted by dts300z I have retained the factory gauge cluster and all the factory functions minus a/c and power steering. I also built my car with the understanding that it will not be a daily driver. If you read my post above it tells you what harness you need to tie into to get the majority of the gauge's to work. You will need to run a wire in the new engine harness for the temp sensor for the factory gauge and tie into the accessory connector coming off the engine harness (located under the dash). The trim pots can be adjusted to dial in the tach but I would recomend a ERA (Electronic Ratio Adapter) for the speedo. Here is a link for the one I'm using http://www.abbott-tach.com/era.htm . The guy who posted the way he adjusted the trim pots to calibrate the speedo was TwinTurbo in this thread http://forums.hybridz.org/showthread.php?t=110873 . Here is a great place to get all your wiring information on the Z http://www.300zx-twinturbo.com/cgi-bin/manual.cgi . Here is Firion 13's thread that also has alot of good information http://forums.hybridz.org/showthread.php?t=125578 . If you look in my build thread here http://forums.hybridz.org/showthread.php?t=141130 you will see how I constructed my mounts. Also there are lots of other good pictures that will be of great value to you guys in all of the above threads including this one. Hope that helps! Dan Also you can view the rest of that thread here http://forums.hybridz.org/showthread.php?t=141356 and it has tons of useful information. I actually ended up using the ABS sensor to get my speedo working (it works great) since the TH350 transmission came with a mechanical speedo.<< dts300z runs an LT1 instead of an LS1 but im sure the basics are similiar. good luck. Quote Link to comment Share on other sites More sharing options...
rwwisnesky Posted June 29, 2009 Share Posted June 29, 2009 Since my last comment, I gave up on the xbox I got from JCI and put a autometer speedometer into my 1978 280z. I removed the gauge from its case and put in into the 280z case so its fits and looks original. I moved the hi-beam, and brake warning light to the tach opening. I used a small auto meter tach and put leds around it and used the existing case also. The jci modified tach was never reliable. Soooo, I preserved most of the original look. Wish I had used the full size tach, and dealt with moving the warning lamps and turn indicators somewhere else, or even put them into the autometer. Should finish putting the dash back in this week. Quote Link to comment Share on other sites More sharing options...
zed240au Posted June 30, 2009 Share Posted June 30, 2009 i bought aftermarket tacho a 3 3/4 one and pulled old tacho apart fitted internals of new tacho to to 240z face plate and into 240z housing needle is not quite as long as std one but works fine using cable x box for speedo gonna try getting shorter cable as it seems to be bit slow to start when i first drive it but once its up and running it works fine Quote Link to comment Share on other sites More sharing options...
qwik240z Posted July 8, 2009 Share Posted July 8, 2009 JCI converted my factory tach and it works great. I have the Abbott industries cable x box for the speedo and I can only get it to within 4 mph of the actual speed. I can live with it. I have all stock gauses with Speed Hut EL gauge faces. Looks stock. Quote Link to comment Share on other sites More sharing options...
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