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Cummins swap done, need tach signal help


4BTranger

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The truck is an 02' 2wd with a 4bt. It's a runner and driver now and I have every gauge working except the tach.

When I got the truck it didn't have a motor so I am looking for some help on how the original setup worked and if I can use the original Ranger tach. The 4bt does not have a tach sensor on the harmonic balancer like the 6bt does.

From what I gather the Ranger tach operates off the ECM...but what language the tach understands is what i am trying to figure out. I can install a sender that works off a magnetic pickup on the alternator or another rotating source if I can determine what type of signal the factory tach reads. I used a dakota digital box for the speedo and I think they might have one for the tach that would work out too.
 


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adsm08

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Most tachs run off a duty cycle that is run from the ignition pulse.

I can't get at the wiring diagrams and shop manuals right now, but a sunpro unit has power all the time, then gets it's ground from the coil ground, and receives a duty cycle ground as the coil ground is engaged and disengaged.


On an 02 the PCM monitors a voltage signal generated by a variable reluctance sensor. I imagine it then translates that to the duty cycle for the tach motor to run at, producing the needle position.
 

snoranger

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Look into the Dakota Digital DSL-1 or DSL-2 (same controller, the DSL-2 comes with a pick-up that will screw into most Cummins bellhousings adapters.)
 

4BTranger

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Thanks for the help guys!! I will give dakota digital a call on Monday and ask them a few questions. Their box worked fantastic for the speedometer and I love how adjustable it is when re-gearing or switching tire size.
 

Rose2300

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pics or the swap didnt happen
 

4BTranger

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pics or the swap didnt happen
Okay, you asked for it!!! Get ready for some high resolution pics b/c I don't have a way to resize them on my tablet....

Stay tuned...
 

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I have a DD DSL-2 sitting here waiting for the 4BT to go into my truck. I already installed the pick-up in the bell housing adapter. I know for sure it will work with the flywheel and I'm about 99% sure it will work with the stock tach.

Go over to 4BTswaps.com and search there. Tons of guys have used it on every different application you could imagine.
 

4BTranger

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4BTranger

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4BTranger

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4BTranger

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Rose2300

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just came a little hahahaha
 

4BTranger

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It is really fun, by far my favorite vehicle. It gets about 33-35mpg on the hwy...who knows what it's getting city because I can't keep my foot out of it.
 

Jraymer360

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if that was a 4x4 i'd steal it. :icon_thumby:

beast truck is beast!
 

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The truck is an 02' 2wd with a 4bt. It's a runner and driver now and I have every gauge working except the tach.

When I got the truck it didn't have a motor so I am looking for some help on how the original setup worked and if I can use the original Ranger tach. The 4bt does not have a tach sensor on the harmonic balancer like the 6bt does.

From what I gather the Ranger tach operates off the ECM...but what language the tach understands is what i am trying to figure out. I can install a sender that works off a magnetic pickup on the alternator or another rotating source if I can determine what type of signal the factory tach reads. I used a dakota digital box for the speedo and I think they might have one for the tach that would work out too.
The factory Tach on ALL EFI rangers is not run off the PCM, but off a specific tach signal from the ignition module. That signal is also sent to the PCM, but it is generated by the ignition module.

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