Tachometer help, please

[Sharkin904]

So my truck is running now, no real problems. 98 Ranger, 00 Expo 5.0...but the tachometer seems to be off. I can't even get on it because the Tach needle dips into the Speedometer and the needles hit lol. Any ideas what could make it read so high? It's a sporttrac cluster, if that makes a difference

 

[85_Ranger4x4]

So my truck is running now, no real problems. 98 Ranger, 00 Expo 5.0...but the tachometer seems to be off. I can't even get on it because the Tach needle dips into the Speedometer and the needles hit lol. Any ideas what could make it read so high? It's a sporttrac cluster, if that makes a difference

You need to reset it, a V8 has more hits per rotation than a V6. The info is out there but I don't know where, you might bug SVTRanger if he doesn't pipe up.

 

[Sharkin904]

I was able to find this on another forum..but I'm not sure what plugs he's referring to. (Granted, I havent taken the cluster out to look) but I'm guessing there's plugs that go to the back of that harness?


" Here is the info i used to get mine working from a 4 cyl to a v8 worked perfect.



Regardless of whether an Explorer or Ranger cluster is used, a ground wire will need to be reconfigured for the V8 swap. It is the dash harness that determines how the tach reads, not the cluster. In the case of a 4-cylinder dash harness, it needs a ground wire added for the V8 tach calibration; Rangers originally built with a V6 need the ground wire moved from one cluster connector to another to correct for the V8 firing frequency.

Tachometer ground differences for 4, 6 or 8 cylinders

8-cylinder: "Selector" ground configuration:
pin 8 of the 10-pin: (NOT connected to anything)
pin 16 of the 16-pin: (wired to chassis ground)

6-cylinder: "Selector" ground configuration:
pin 8 of the 10-pin: (wired to chassis ground)
pin 16 of the 16-pin: (NOT connected to anything)

4-cylinder: There is no "Selector" ground
pin 8 of the 10-pin: (NOT connected to anything)
pin 16 of the 16-pin: (NOT connected to anything)


The above should be correct for these RBV's:
1996~2003 Ranger/
1996~2003 2-door Explorer Sport
1996~2001 4-door Explorer
2001~2003 Sport Trac "

 

[win]

Def time to pull the cluster. There are 3 plugs and you have the info to change the right wire.

Try the wiring change, if the tach still goes crazy, it'll be time to dig deeper.