tachometer not working...

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.Grimace
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i have a 90' 240sx and just did a sr20 swap. speedometer works but only like 50/50? and tachometer never works. i searched around here and saw i'd need a 91-93 cluster or a jdm one so i bought one. just got done putting it in and nothing it still does not work. could the jdm cluster i got be a 89-90 one? it redlines at 9k if that helps.

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ajones1229
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check your wiring.
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.Grimace
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i ran through it all and it looks good. could my speed sensor be going bad? maybe why its on and off wether it works?
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ajones1229
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I would check it out for sure.
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KDashy
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The plug could've fell off the speed sensor.

Or the speed sensor could be malfunctioning.
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redtop91
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.Grimace wrote:i searched around here and saw i'd need a 91-93 cluster or a jdm one so i bought one.
Which one did you get? Also I second the speed sensor as a probable source. Does the tach even move or is it just inaccurate?
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.Grimace
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i got the jdm cluster. just got everything put back together and it works now and reads the kmph perfect. but still no tachometer. the tach doesn't move at all never has. were does it get its signal from? is it from the speed sensor too? sorry i am new to nissans, i use to be a civic guy were it reads from the distributor.
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redtop91
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IIRC the JDM cluster has to be modified to readout properly for speed and RPM. For speed the potentiometer has to be adjusted I think and a resistor added.
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.Grimace
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i didn't do the wiring sadly and now i wish i had. i just did all the mechanical work while a friend who did his sr20 swap did my wiring. gonna get his help tomorrow to look it over. now all i need to work is the tachometer the speedometer works perfect. where does it get the signal for the tachometer from? ty too for all your help
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redtop91
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Directly from the ECU/Speed sensor.
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.Grimace
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ahh i c, ty i guess i am off to check over all the wiring
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redtop91
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There are going to be two wires from the ECU that you want to focus on. One (If you had a DOHC harness at least) should be yellow with a red stripe (Tach) and yellow with a green stripe (Speed) I think. Someone will correct me if I'm wrong for certain though.
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.Grimace
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alright thank you i'll go see what i can see.
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White Comet
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redtop91 wrote:There are going to be two wires from the ECU that you want to focus on. One (If you had a DOHC harness at least) should be yellow with a red stripe (Tach) and yellow with a green stripe (Speed) I think. Someone will correct me if I'm wrong for certain though.
beat me to it.
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White Comet
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redtop91 wrote:IIRC the JDM cluster has to be modified to readout properly for speed and RPM. For speed the potentiometer has to be adjusted I think and a resistor added.
how do u modify the tach to work? im getting a jdm cluster soon
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got chub
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the speed sensor does not run the tach at all.... its late and i think i missed something here
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White Comet
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true, but im asking about the tach now cuz i want the jdm cluster to work
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574-240sx
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Sounds like you got your wiring wrong for the tach.
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White Comet
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yeah let us know if any of these works
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.Grimace
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574-240sx wrote:Sounds like you got your wiring wrong for the tach.
i hope not. i really suck at wiring going to have my friend look it over tomorrow. nissans are so different then hondas i am trying to learn a lot at once. mechanically it was easy but the wiring is tricky
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White Comet
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.Grimace wrote: nissans are so different then hondas
well duh
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redtop91
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White Comet wrote:true, but im asking about the tach now cuz i want the jdm cluster to work
BYAAAAAAAAAAAAAH! That was wrong. I was thinking about making the JDM speedo for 180 kph read in MPH. It'll work fine as it is for KM/H.

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White Comet
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so wait the tach will work fine w/ no probs?
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redtop91
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That'd be my guess, just the speed sensor would be off.
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White Comet
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k thought so at first, but this thread threw me off, lol. im gonna convert the speedo to mph thu, still need to mess w/ the speed sensor, would i need a dif sensor?
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redtop91
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No just a resistor to alter the signal from the speed sensor so the Speedo thinks it's reading KM/H when it is reading MPH.
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White Comet
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thought so. the mist has cleared and i know whats going on (give it time, that'll change)
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