tach wiring ? - Diesel Forum - TheDieselStop.com
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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post #1 of 19 (permalink) Old 11-29-2009, 12:12 PM Thread Starter
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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

'91 E350 7.3 , facet Duralift fuel pump , snglmass flywhl, ZF 5spd trans, 2 piece drive shaft, 3.55 d60 lsd moosiahmobile project.... '81 volksdiesel Frankenbunny ,more Audi than Golf OR Rabbit!
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post #2 of 19 (permalink) Old 12-02-2009, 01:30 AM
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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

1996 e350 7.3 powerstroke.
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post #3 of 19 (permalink) Old 12-03-2009, 12:50 AM
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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.

Nick

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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post #4 of 19 (permalink) Old 12-03-2009, 01:22 AM
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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.

2000 E350 DRW XLT extended wagon (yes! it's a dually!)
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post #5 of 19 (permalink) Old 12-03-2009, 01:24 AM
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Mine probably was CTO. Its been a while. I'll have to go back through some wiring diagrams and look.

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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post #6 of 19 (permalink) Old 12-03-2009, 01:42 AM
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Just looked at my van and it is the CTO wir. Thanks carringb.

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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post #7 of 19 (permalink) Old 12-03-2009, 08:33 AM
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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,

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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post #8 of 19 (permalink) Old 12-03-2009, 01:24 PM
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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.

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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post #9 of 19 (permalink) Old 12-04-2009, 12:49 AM
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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

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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post #10 of 19 (permalink) Old 12-04-2009, 03:09 AM
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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%.

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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post #11 of 19 (permalink) Old 12-08-2009, 03:16 AM
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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?

1996 e350 7.3 powerstroke.
4" exhaust. custom intake. DP-tuner f5.
stage 1 diy injectors
tugger hd2 shift kit
tripple disc billet converter
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post #12 of 19 (permalink) Old 12-08-2009, 07:47 AM
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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.

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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post #13 of 19 (permalink) Old 12-08-2009, 01:03 PM
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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.

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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post #14 of 19 (permalink) Old 12-12-2009, 12:53 AM Thread Starter
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so , is there a CTO wire in a 88-91 van wire harness?

'91 E350 7.3 , facet Duralift fuel pump , snglmass flywhl, ZF 5spd trans, 2 piece drive shaft, 3.55 d60 lsd moosiahmobile project.... '81 volksdiesel Frankenbunny ,more Audi than Golf OR Rabbit!
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post #15 of 19 (permalink) Old 12-12-2009, 06:00 AM
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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.

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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