So I installed a 9k RPM redline tach the other day since I’m building an LSV motor and will have the ability to rev higher. I pulled my old cluster out, not all the way I just got the speedo cable unhooked from the engine bay and pulled the cluster out a little.
Anyway I took the old tach out, but all that was holding it in place was 5 screws. The tach gauge I got had a white box that snapped behind the actual gauge, which my 8k tach gauge didn’t have so I didn’t install that box with the new tach.
What’s that white box for, why didn’t I have it behind my tach and will it be an issue with this new tach?
If i remember correctly the white box is a VSS booster to clean up the signal and also has some thing to do with cruise control. Some please correct me if i am wrong been a while.
Dude your retro fitting a after market rpm tach into the original cluster. You have to share and tell us how you made this possible, Im tired of my old cluster and guessing my 8,5k rpm shift points.
Anyone else on the white box issue? If it is for cruise control, then how does the tach get the RPM reading? Nothing is connected to the tach besides the bolts that hold it in the cluster, and that was the case for the one I took out as well.
like i told you on facebook it is for the cruise control. my 91 RS cluster doesn’t have the box but my 92 GSR does since all GSR’s had cruise control. the rpm get’s its signal from the distributor through the wiring harness.
the tach receives the signal from the pin A4 and it’s a blue wire which comes directly from the distributor.
Ok, maybe I’m just not following then. HOW does it get the signal, when the only thing connected to the tach is those 5 screws; nothing else is plugged into the tach, nor was plugged in the original tach I took out. I get the part that it gets the signal from the distributor, but if NOTHING is connected to it but those 5 screws, and that was always the case, then how the hell does it get the signal cause unless it’s wireless I’m just not comprehending this.
The circuit board is connected to the needle and whatnot, and the bronze back of the gauge, but nothing plugs into the board from the car, or the cluster.
just trying to help. i want to know what its for too. i thought it was for the cruise control, but now OHIO4DRDA says its for the vss…
i took the chip out of the jdm one…
The back of my cluster the way it is in my car now, is just like the back of your clusters, only without the white box now, and nothing at all plugged in any of those plugs EXCEPT the speedo cable.
Is that normal? Are the other plugs not supposed to have anything in them?
So can anyone explain how the tach gets a signal from a distributor, or anything for that matter, by it only being held up by the screws? Magnets perhaps, or what? If this is such an easy answer then why can’t I find any answer for this on this forum, Honda Tech or Google…
I finished dropping the motor back in, hooked everything back up started the car… and tach isn’t working. Go figure! So again, what needs to be connected for this to work? Like I said, when I put the XSi tach in, I didn’t change ANYTHING in the back of the cluster, I just unscrewed the LS tach, put the XSi tach, and now it’s not working. Obviously something else needs to give it the power, so what am I missing.
That’s where I looked, and here are pics for who don’t have a Helms…
Do I have to plug in connectors A, B and C? Also in the 2nd picture I pointed to the 5 bolts I am talking about as the only thing connected to the tach. Can’t find any mention of connector A, B or C in the manual so could those be what I need to plug in for the tach to work?
Plugged connectors A and B in, tach still doesn’t move. Is there a way to test if the gauge itself is bad? The needle starts at 0 and moves if I move it with my finger. I’m out of ideas as to what else to try besides putting the LS tach back in.
I just swapped in my USDM-gsr gauge for the USDM-LS gauge that was in. Noticed that the LS gauge had the wire with bulb and the GSR one didnt. GSR had that black round thingy in the box on the board. It is for cruise control just wondering why the gsr one doesnt have the wiring for the bulb like the LS one did.
