2G Tach jumps around

[Yamahaulin]

Where does the tach in the instrument cluster get it's signal from? Mine jumps around but while logging it in link it doesn't.

 

[TSiAWD666]

PTU

 

[Yamahaulin]

So the white wire goes directly to the tach from the ptu?

 

[1Badvan]

Coil pack>PTU>ECU>Dash

 

[Yamahaulin]

Well the ecu is getting a good signal or link wouldn't be showing smooth rpm increase. What pin does it come from ecu and go to tach?

 

[babyviper]

Does anything else act weird on your dash? Might be corrosion of the fuse block. I had that issue.

 

[Yamahaulin]

Speedo kinda bounces a little. What fuse block you referring to the one in the cab under gauges? Also have an issue with the lights getting brighter when I rev the car up but not sure the problems are related.

 

[1Badvan]

Well the ecu is getting a good signal or link wouldn't be showing smooth rpm increase. What pin does it come from ecu and go to tach?

Pin 58 on the small plug should be tach signal

 

[Yamahaulin]

Take that back speedo is all jacked it just bounces from 10-20 no matter how fast ya go.

 

[babyviper]

I'm almost 100% sure it's the fuse block then. It is the small fuse box located in the cab by the foot rest.

http://www.dsmtuners.com/threads/fuseblock-problem-resolved-almost-fixed.234178/

 

[Yamahaulin]

Well wasn't the fuse block. Turns out that the power wire to the starter got smashed and had been exposed and was shorting out and had melted through some of the wires around it. Once i repaired it and the 4 wires it burnt up all my problems went away.