stan401 Posted April 3, 2012 Share Posted April 3, 2012 im gaining parts for my 240z with a sr20det swap but one of my main problem is my speedo,im actualy going to use a fairlady Z original speedometer since my car will be a jdm replica but i bought my 240km/h speedo before finding out the sr20det from a s14 had an electronic speedometer. so anybody know what speedo gear to use to change it to a wire speedo from a Z? i dont care if its not acurate as long as i have some reading... Quote Link to comment Share on other sites More sharing options...
logr Posted April 5, 2012 Share Posted April 5, 2012 You can use the cable type from many transmissions from the stock Z one to Datsun pickups. The question will be which one you need to get an accurate speedo. I am using a black gear with an SR and 4.11 diff. I believe there is a link on here about the different ratios and color of the trans gear. You may need to rotate the gear housing a bit to get the gears to mesh well. Check out my thread on using a 280Z tach in the 240Z housing to get an original looking tach that works with an SR or most any engine, if you are interested. Quote Link to comment Share on other sites More sharing options...
logr Posted April 5, 2012 Share Posted April 5, 2012 Rereading your post, I hope that is what you were looking for, not sure("change it to a wire speedo"). Did you mean cable? Quote Link to comment Share on other sites More sharing options...
stan401 Posted April 5, 2012 Author Share Posted April 5, 2012 i just noticed that it may be confusing, by wire i mean cable i want to keep the original cable one but on the S14 they are electronic so i need a new gear in the transmition for a cable one for my tach i already bought an aftermarket one that work with 4-6-8 cylinder and since im using Wiring Specialties harness it will be easy to plugg in. Quote Link to comment Share on other sites More sharing options...
VKLR Posted April 6, 2012 Share Posted April 6, 2012 http://www.summitracing.com/search/Product-Line/Auto-Meter-Programmable-Electronic-Speedometer-Senders/?keyword=speedometer+electronic&autoview=SKU or go with Speedhut GPS unit Quote Link to comment Share on other sites More sharing options...
emeraldlion Posted April 6, 2012 Share Posted April 6, 2012 He doesn't want to go the speedhut route because he is trying to look original jdm. The summit link provided, or a cable-x box like you can buy at brokenkitty.com for v8 swaps is your best bet. Quote Link to comment Share on other sites More sharing options...
VKLR Posted April 7, 2012 Share Posted April 7, 2012 (edited) OK so as far as i know he could use the speedo "bullet" part out of a rb20 trans. They have a cable and should fit right in the sr-ka trans. I even think the part out of a zx 5sp would work also. One would have to pull the trans apart and add the drive gear. Edited April 7, 2012 by VKLR Quote Link to comment Share on other sites More sharing options...
VKLR Posted April 7, 2012 Share Posted April 7, 2012 OK so as far as i know he could use the speedo "bullet" part out of a rb20 trans. They have a cable and should fit right in the sr-ka trans. I even think the part out of a zx 5sp would work also. One would have to pull the trans apart and add the drive gear. Speedhut can print anything on the face of the speedometer. Make it look like the old one.... Quote Link to comment Share on other sites More sharing options...
luseboy Posted April 11, 2012 Share Posted April 11, 2012 I wouldn't be surprised if speedhut would even go so far as closely matching the backplate and needle out of your fairlady tach onto one of their gauges. Try emailing/calling them to find out for sure but I'm sure they'd do it. The speedhut gauges are nice, they run off gps, and have some cool features like a 0-60 time setting, a 1/4 mile time setting, etc. Pretty darn cool. If you already have an aftermarket tach, might as well sell the jdm speedo and get a normal speedhut gauge, it's not like the heart of the car will be oem jdm either... Quote Link to comment Share on other sites More sharing options...
logr Posted April 11, 2012 Share Posted April 11, 2012 It's still Datsun, only a newer version. Not that anything is wrong with going a different direction. I am very happy with my 240Z T28 SR and it looks stock until you open the hood or get in a race. Quote Link to comment Share on other sites More sharing options...
neotech84 Posted April 11, 2012 Share Posted April 11, 2012 One problem I see is we need to know what trans you plan on running, because from what I recall the S14 speedo gets its input from the diff. Quote Link to comment Share on other sites More sharing options...
luseboy Posted April 11, 2012 Share Posted April 11, 2012 One other possibility if you're handy is you could use the s14 system and just put the inards in your fairlady speedo. Im not sure how that would work out but I don't think it would be too terribly hard. Would be cool, that's for sure! Quote Link to comment Share on other sites More sharing options...
Mike-Z Posted April 16, 2012 Share Posted April 16, 2012 (edited) How closely related are the SR and KA transmissions? I have heard of people using the cable senders from older Nissan's on KA's Can I link to other forums? Here is how some 510 guys did it 510 solution More talk about 510 solution DQ Volume 9 Issue 3 - Tech How-To: Speedometer Pinion Replacement -- Keep using your stock 510 speedometer with a modern engine swap. I'm very new to the Z so make of this what you will Edited April 16, 2012 by Mike-Z Quote Link to comment Share on other sites More sharing options...
stan401 Posted September 3, 2012 Author Share Posted September 3, 2012 the gear i had for my z on my ZX 5 speed is working so i have a jdm cluster working not sure about its accuracy but it works Quote Link to comment Share on other sites More sharing options...
fast-datsun Posted December 13, 2012 Share Posted December 13, 2012 We use electric but a RB20 manual speed gear set may work for you.... Quote Link to comment Share on other sites More sharing options...
69sroadster Posted February 22, 2013 Share Posted February 22, 2013 I just used the bullet manual assembly from my S130 5 speed transmission. The gear didn't match the SR tranny, but all I had to do was remove the 280zx gear (molded on PITA), grind the shaft it was removed from the a half moon shape to permit the SR tranny gear to slide on. In the process of the grinding and heat the SR gear basically molded itself to the modded 280zx manual speedo sender unit. I've also been told you should be able to use any Z31 5 speed sender in the SR tranny as a direct swap. I have one of those too now but haven't tried it since my modded unit has been working since I installed it. I've also been told any of the RB 5 speed units will work. I was concerned that by taking out the electrical speed input from the ECU that it might trigger a limp mode but that has not been the case. Oddly though, on a chance to do a high speed run I did have the ECU cut out at around 145 mph (5500 or so rpm in 5th). I don't know how/why it did that but I'm not concerned since I never really need that much velocity up there. Quote Link to comment Share on other sites More sharing options...
Nigel Posted February 25, 2013 Share Posted February 25, 2013 I used a 280ZX speedometer gear (blue for 3:7 diff) and housing in my S14 transmission. Bolted right in and works great. I didn't think the SR 5 speeds were any different internally? Nigel Quote Link to comment Share on other sites More sharing options...
69sroadster Posted February 25, 2013 Share Posted February 25, 2013 Nigel that's interesting since mine was just a bit smaller in diameter it wasn't making contact with the SR drive gear inside the case. I wonder if mine was just worn down or if the transmission was different internally. It would have been a lot easier for me if I didn't have to get that ZX gear off. Quote Link to comment Share on other sites More sharing options...
Xnke Posted February 26, 2013 Share Posted February 26, 2013 The SR transmission is just another FS5W71C transmission as far as the speedo gears go. Just use the cable drive from the original 240Z transmission, knowing that you may have to rotate the cable drive to get the gears to mesh up...the shaft is offset depending on the rear end ratio, because the rear end ratio sets the size of the speedometer gear...NOT the transmission. Also, around 1981 the retaining clip bolt hole went from the bottom side of the cable drive/sending unit to the top side, 180* flip. DO NOT just flip the gear drive...it may not fit and then it'll break! You need to install the cable drive, then rotate it until the gears mesh up, then mark and file a new retaining clip slot into the original housing. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.