Another 33gtst rpm tacho issue

[shadow21189]

Hello everyone. I am sorry to bring up old threads I have a 1996 r33 gtst s1.5 that has as far as I have had it has not had a working RPM tacho. I have searched the forums to no prevail. I might add that the car is powered by an Apexi Power FC if it makes a difference to the issue I'm having.

Ok inititally the tacho never worked.. so I went with simplicity and bought another tacho for it which to my frustration didn't fix my issue. so I started dabbling in the forums and followed tutorials. ive tried the re solder/flow method at the back of the tacho which surprisingly mad a minor difference to which I had no working rpm tacho to now the needle jumping up past 9000rpm and staying there and not moving lol. I started getting on the more technical side of things testing earths volts yada yada. I'm getting a good ground and I'm getting 12v across ignition.... Now on to the rpm signal wire. Testing from the back of the TAM pin I got a reading of 0.9 - 1.9v now I for the life of me can not find what range the signal wire is meant to be in no one ever seems to mention it on the threads so I ask is this the range and if its not what is? I also then went back to the ecu on pin out 7 and got the same reading. NOTE! I did use an LED testlight that has an inbuilt volt meter that's how I was getting my readings. My auto electrical knowledge is very basic at the least... so on to my last resort I got and after market 2"rpm gauge just a cheapy from ebay for around 30 bucks to see if that would work and still nothing so now I'm slightly pulling my hair out as the car is ready for the track now and will be hard on th high rpm scale so it would be nice and safe for me if I could get this fixed so if anyone has a souloution or perhaps any advice as to what I may be doing wrong please don't hesitate to mention. and thank you in advance.

[zoomzoom]

Search for tachometer fix on these forums. I built a new tacho driver from scratch. You'll need some electronic knowledge though. For starters you'll ideally want an oscilloscope to see if the cluster is even getting a pulsed signal from the ECU for the RPM.