~KnuckleDuster~ Posted September 16, 2008 Share Posted September 16, 2008 Need a bit of help here gents. I wanto keep my stock tach but were unsure on how exactly to hook it up. Theres an MSD Dis-Tach Driver installed but not currently wired to anything. I did a bit of searching and found this http://wiki.r31skylineclub.com/index.php?title=Wiring_a_Silvertop_RB20DET_into_an_R31 ..but not sure since its an rb20. Any help would be greatly appreciated! -Adam Quote Link to comment Share on other sites More sharing options...
Z24O Posted September 17, 2008 Share Posted September 17, 2008 can't remember where i got this diagram from also i am pretty sure you have to use a 260/280z as the 240z one is not compatible Quote Link to comment Share on other sites More sharing options...
EMWHYR0HEN Posted September 17, 2008 Share Posted September 17, 2008 Adam, Is there any particular reason why you want to keep the stock tach? As far as I know there isnt any stock tachs compatable with the RB. Autometer makes tachs that fit almost perfect in the stock tach hole on the dash. Quote Link to comment Share on other sites More sharing options...
jakeoster Posted September 17, 2008 Share Posted September 17, 2008 They dont work? I must be extremely lucky. I found an autometer monster tack in my garage a few weeks ago. I didnt know I would need it. sweet Quote Link to comment Share on other sites More sharing options...
~KnuckleDuster~ Posted September 17, 2008 Author Share Posted September 17, 2008 Adam, Is there any particular reason why you want to keep the stock tach? As far as I know there isnt any stock tachs compatable with the RB. Autometer makes tachs that fit almost perfect in the stock tach hole on the dash. I just wanted to leave the interior somewhat original.. Guess Ill have to upgrade. Quote Link to comment Share on other sites More sharing options...
jakeoster Posted September 18, 2008 Share Posted September 18, 2008 I see your reasoning, maybe it is possible to do it. Ill have a looksy when I go to remove my stock one. Quote Link to comment Share on other sites More sharing options...
~KnuckleDuster~ Posted September 18, 2008 Author Share Posted September 18, 2008 I see your reasoning, maybe it is possible to do it. Ill have a looksy when I go to remove my stock one. Cool appreciate it. Quote Link to comment Share on other sites More sharing options...
stony Posted September 19, 2008 Share Posted September 19, 2008 Anybody care to explain how to get the auto meter tach to work off the engine harness. I'm using the HKS vpro and it doesn't have a direct tach output. i have to use the coil harness. i wired in a tach adapter according to the instructions but it didnt work Quote Link to comment Share on other sites More sharing options...
jtmny1999 Posted September 19, 2008 Share Posted September 19, 2008 Anybody care to explain how to get the auto meter tach to work off the engine harness. I'm using the HKS vpro and it doesn't have a direct tach output. i have to use the coil harness. i wired in a tach adapter according to the instructions but it didnt work < I always thought the only way was to use the tach adaptor. I know there is a cheap one from summit for 30 bucks. Quote Link to comment Share on other sites More sharing options...
~KnuckleDuster~ Posted September 19, 2008 Author Share Posted September 19, 2008 If I have to get a 260/280 tach I can do that..theres a few at the junk yard. So tach adapter + later model tach might be the trick.. Quote Link to comment Share on other sites More sharing options...
china elephants Posted November 9, 2008 Share Posted November 9, 2008 just did my tacho rb20det you need to take the tacho speed feed from the ecu on pin 7 and spice it with a 12v pin 49 feed and on the feed to the tacho line use a 10k resister. Quote Link to comment Share on other sites More sharing options...
getoffmyinternet Posted November 22, 2008 Share Posted November 22, 2008 This is for the rb to work with the 240z gauge, or the 300zx? Quote Link to comment Share on other sites More sharing options...
china elephants Posted November 24, 2008 Share Posted November 24, 2008 This is for the rb to work with the 240z gauge, or the 300zx? mine is a speedhut one don't know about the stock but thats how i would go about it you might need a tach adepter for stock one sorry don't know Quote Link to comment Share on other sites More sharing options...
jerryb Posted November 25, 2008 Share Posted November 25, 2008 Thats pretty clear..... mine is a speedhut one don't know about the stock but thats how i would go about it you might need a tach adepter for stock one sorry don't know Quote Link to comment Share on other sites More sharing options...
stony Posted November 25, 2008 Share Posted November 25, 2008 I always thought the only way was to use the tach adaptor. I know there is a cheap one from summit for 30 bucks. Yea im pretty sure also... Just wondering if anyone had done it and maybe have a diagram with wire colors and all. Again i have to pull my tach signal from the engine harness. There is no tach out (that i know of) as the HKS computer was designed so you could maintain the stock computer for all the gages and crap. Quote Link to comment Share on other sites More sharing options...
chrism Posted December 4, 2008 Share Posted December 4, 2008 Most Tachs old or new use a 12v signal from the coil. If you can find a 5v signal then do what china elephants suggested. It is called a pull up resistor. It pulls the 5v signal up to 12v so the tach can trigger off that voltage level. I have the autometer tach and this is what I did. works great. Should be able to do the same thing with the stock tach. Might want to use a 10k resistor to be safe. Quote Link to comment Share on other sites More sharing options...
jtmny1999 Posted December 4, 2008 Share Posted December 4, 2008 Most Tachs old or new use a 12v signal from the coil. If you can find a 5v signal then do what china elephants suggested. It is called a pull up resistor. It pulls the 5v signal up to 12v so the tach can trigger off that voltage level. I have the autometer tach and this is what I did. works great. Should be able to do the same thing with the stock tach. Might want to use a 10k resistor to be safe. O yeah I got my RB25det to work with the autometer tach. Works great. Thanks for the diagram Quote Link to comment Share on other sites More sharing options...
EMWHYR0HEN Posted December 5, 2008 Share Posted December 5, 2008 Anybody care to explain how to get the auto meter tach to work off the engine harness. I'm using the HKS vpro and it doesn't have a direct tach output. i have to use the coil harness. i wired in a tach adapter according to the instructions but it didnt work < It's actually quite simple. Theres a 12V power source coming from the ignitor chip that powers all six coils. Cut the power source wire after the ignitor chip, before the six coils and splice in the tach adaper. I Know MSD and Autometer make one and share the same wire colors. The red wire connects to the power source wire towards the ignitor chip/ignition relay direction, the red/green wire connects to the other power source wire in the direction of the six coils. The other two wires are ground and tach signal. It basically works by splicing into the coil power source wire and "sences" when a coil draws current and transmits that into a tach signal. Just makes sure you have a tach adapter for a distributorless ignition system. That's MSD # 8913. Quote Link to comment Share on other sites More sharing options...
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