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E-Series Vans Technical discussion of topics related to vans powered by any of the Navistar engines. This covers a broad number of years, but there isn't enough demand to split it any further.

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Old 11-29-2009, 12:12 PM   #1 (permalink)
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Thumbs up tach wiring ?

does any body know if there is a wire in the harness to run a tach like the 'f' pickup models?? OR where do you pickup a signal to run a stock tach???? I have a stock one out of a f250 /6,9 dash ...If I can get a signal off the engine (I have the pickup on the injection pump drive) I could run this tach ... gluing magnets to the front pully has little to no appeal to me
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Old 12-02-2009, 01:30 AM   #2 (permalink)
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i am going to install remote start this weekend and i also nead a tach signal. one of the wires from the cps, i think that they send a tach signal. but i dont know witch of those 3 wires that are tach signal that i can use for the remote starter
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Old 12-03-2009, 12:50 AM   #3 (permalink)
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Look for the white/pink wire labeled PTO in the harness above the brake booster. I used that when I put a 00 SD cluster in my 97 van. Only problem is that the newer 7.3 has a lower tach signal so it looks as if I am shifting at 5-5500 rpm. I'll fix it one day though. Wouldn't trade the look of the newer cluster either.
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Old 12-03-2009, 01:22 AM   #4 (permalink)
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The wire wanted is the CTO (clean tach output). PTO wiring is to raise idle when a PTO device is attached and engaged.

No idea how far back this wiring goes. My '94 had it.
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Old 12-03-2009, 01:24 AM   #5 (permalink)
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Mine probably was CTO. Its been a while. I'll have to go back through some wiring diagrams and look.
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Old 12-03-2009, 01:42 AM   #6 (permalink)
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Just looked at my van and it is the CTO wir. Thanks carringb.
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97 E350
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Muffler and Cat Delete
Rebuilt trans with updated parts
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Old 12-03-2009, 08:33 AM   #7 (permalink)
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Since we are on this subject. Does anyone have any suggestions on how to lower the tach signal to make the tach out of the newer 7.3(99-up) work with an older 7.3(94-97)?

Is there any way to create a new tach signal to work with this cluster?

Thanks,
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Muffler and Cat Delete
Rebuilt trans with updated parts
More to come but I won't bore you with that crap till its done.
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Old 12-03-2009, 01:24 PM   #8 (permalink)
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You'll need a signal converter, so change the number of pulses. Sounds like need to eliminate every other pulse, so there's probably something cheap available from an electronics catalog.

I maybe possible to use a signal converter intended for speedometers too. There's always a bunch of ads for those in magazines like Truckin and Petersons.
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2000 E350 DRW XLT extended wagon (yes! it's a dually!)
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Banks Powerpack, Diablo Predator
Buckstop front bumper, Reunel rear w/ 20,000# reciever
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Old 12-04-2009, 12:49 AM   #9 (permalink)
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I'll have to check them out. I have gotten to like this cluster in my van a lot and don't want to take it out. And I really don't like the look of a tach seperate from the cluster, in a van atleast. Just my opinion though.

Thanks carringb
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97 E350
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230,000 Miles
Muffler and Cat Delete
Rebuilt trans with updated parts
More to come but I won't bore you with that crap till its done.
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Old 12-04-2009, 03:09 AM   #10 (permalink)
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This is a little pricey ($100) but at least its designed for automotive applications.

This can convert any digital signal, so for others reading this... those can fix a speedometer error too on the gasser vans and 6.0 PSD vans.

Bluegauges.com - Yellow Box Speedometer Correction

Looks easy to insall set up (may need some tweezers to select dip switches). For your tach, set it to 50%.
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Banks Powerpack, Diablo Predator
Buckstop front bumper, Reunel rear w/ 20,000# reciever
250,000+
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Old 12-08-2009, 03:16 AM   #11 (permalink)
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where can i get the cto wire for my remote starter, is it at the same contact that the pto is? harness above brake booster?
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stage 1 diy injectors
tugger hd2 shift kit
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Old 12-08-2009, 07:47 AM   #12 (permalink)
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The CTO wire is what you want. Forget that I said anything about the PTO. I got them mixed up and I don't think there is a wire that says PTO. But, the wire you want will be white/pink, will be cut off, and have a label on it that says CTO.
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97 E350
Extended Cargo
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230,000 Miles
Muffler and Cat Delete
Rebuilt trans with updated parts
More to come but I won't bore you with that crap till its done.
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Old 12-08-2009, 01:03 PM   #13 (permalink)
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Yes, there is a PTO wire. And yes it is in the same bundle as the CTO wire (the one you want a tach or remote start). The same bundle may also have a 4x4 low wire on some models.
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2000 E350 DRW XLT extended wagon (yes! it's a dually!)
17" Ultra Goliath rims
Banks Powerpack, Diablo Predator
Buckstop front bumper, Reunel rear w/ 20,000# reciever
250,000+
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Old 12-12-2009, 12:53 AM   #14 (permalink)
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so , is there a CTO wire in a 88-91 van wire harness?
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Old 12-12-2009, 06:00 AM   #15 (permalink)
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Dang. After all this talk I didn't realize that you had a 91. Sorry I'm not sure if there is a wire for that one.
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Nick

97 E350
Extended Cargo
7.3 Stroker
230,000 Miles
Muffler and Cat Delete
Rebuilt trans with updated parts
More to come but I won't bore you with that crap till its done.
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