Ok need tach help

[gomer23]

I absolutely can not get the tach to move at all. Heres what I did. I ran the yellow/blue wire from the White RB plug to the Yellow/Red wire and the tach wont move at all. I have checked every fuse 2 times and went through with a multimeter once to check them all and no luck on that. I have tried the Red/yellow wire. I have reconnected many times with no luck. What else needs to be done? I cant figure this out for the life of me.

[Kansei240sx]

If you're using a SOHC tach, you're **** outta luck, that wont work period... You'll need a DOHC tach. Sorry guy.

[armysweitzer]

what tach are you using?

[gomer23]

If you're using a SOHC tach, you're **** outta luck, that wont work period... You'll need a DOHC tach. Sorry guy.

Now see I read that before but my friend has a SOHC...same year as my car (and color haha) and his worked fine when his car ran. Otherwise I would agree with you on that.

[Kansei240sx]

Thats fuacked up. Every single RB swap, SR swap i've done or helped out with thats been in a SOHC chasis with correct wiring, the tach didnt work period, the speedo will but the signal thats sent to the tach is different.

I have no idea how the hell his tach works, much be a glitch or something.

[Darius]

I'm not familiar with the S13 wiring, but all that needs to happen is you need to find your tach signal wire on the S13 harness that goes to the gauge. Once you find that, you're golden because that's the "tough" part. Look at a wiring diagram in the FSM for the color.

Then, buy a dakota digital tach signal modifier $75 and splice into the ECU harness for the ECU tach signal out. Run that into the signal modifier along with a power and ground source. Then run a wire from the output of the modifier to the S13 tach meter wire you found earlier and voila. Done!

Others have used the Greddy E-01 boost controller for the tach signal but have found that it's slow to react compared to the stock needle and results in post redline shifts. You don't need a tach signal modifier in this case because the Greddy unit can convert it for you. I personally like the clean look of my stock gauges so I went the Dakota Digital route.

[projeks13]

will the dakota unit work with a sohc tach?

[Darius]

I'm assuming so, but call them (605) 332-6513.

[integra7]

I don't know about the S13 tach....

But for the s14, there is an adjustment knob on the back of the tachometer. All you need is to hook it up to something that will give you a tach reading (i.e. power fc, safc). And just adjust the tach to the reading. No need for the dakota signal modifier. And its free......

Darius...any reason you didn't do this and save yourself $75? (since you have an S14)

[Darius]

Actually I bought the thing about a month before I got my motor just trying to get parts in on time. I hadn't heard of anybody adjusting anything on the stock cluster until a couple months after that. Plus, I still don't know how accurate those readings are throughout the entire gauge spectrum. Has anybody compared their readings to a PFC or something?

[gawdzilla]

^ yea, mine is fairly accurate (within 100 rpm i'd say) throughout the rev range when checked against pfc. but for a free, 15 minute mod, i'll take it.. oh new icon!

[integra7]

yeah, its as accurate as the stock tach can get.

[gbaz77]

i bought a maxima tach unit, and just replaced the circuit board part with the s13, works wire to wire, no signal unit needed! and you can go pick up a maxima tach from the junkyard and i wouldnt be surprised if you could pick one up from the nissan dealer for less than 75 dollars.