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Discussion Starter #1
I'm having best buy install a remote starter on my 2003 7.3 excursion tomorrow. I went with a viper 5301 two way unit. The installer told me that I would need to purchase a separate "tach generator" since it is a diesel. He told me that the diesels do put out a tach signal but that is was a "dirty signal" that wouldnt work. The remote starter needs a clean signal to know when the engine is running.

Is he right? I knew that I would need additional parts for the install but this is a new one for me.
 

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I was told the same thing, so my remote start was installed with no way to tell if the engine is actually running or not... did you end up getting a tach generator? Or is the signal actually clean enough for a viper on a 7.3 to not have a problem?
 

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Discussion Starter #5
The installer told me after the install that he did try it without the tach signal generator to see if it worked. It didn't. The truck shut off after 15 seconds or whatever the default is. He told me that without a strong tach signal, the remote starter can't confirm that the engine is running and will shut off after 15 seconds. After he hooked up the tach signal generator, everything worked fine.

It wasn't very expensive ($35 I think ???), so I figured that it was worth it. This way, I wont have any problems down the road if I need to bring it in for warranty work. Places like to void your warranty if you don't let them install it their way.

I've had it all on for three months now with absolutely no issues. I've been very happy with it. Plus, Best Buy gives a lifetime warranty on the labor and install.
 

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Discussion Starter #6
For what it's worth, the Viper 5301 is an awesome system. It has worked flawlessly for me so far (only 3 months). It was worth every penny to upgrade to the 2-way remote. I couldn't imaging not having confirmation that the truck started or that the door locks responded. I usually can't see my truck when I hit the start button. With the 2-way, I always know. I also know if I hit the buttons by accident and can cancel the command with the touch of a button.

I'm likely going to get the exact same system for my wife's car this winter.
 

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I've got two remote starts on 7.3 96 and 01 X with out the tach signal generator plus most systems can read voltage to see if it's running.
 

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Is there any chance you could find out who makes that tach adapter/what the part # was? My installer isn't familiar with this tach adapter, so I need to get the info or the part for him to put it in.

I've searched around and found a couple of options, but don't know which one to try:

First, I found this DB-TACH2 by Omega: here

Second, this "Peripheral PDATACH2 Ford tach generator" Peripheral PDATACH2 Ford tach generator - PDATACH2] here

The other thought I had was the MSD GMR (8918) hooked to an injector wire at the IDM or valve cover harness.

If you were able to tell me what you got (since it worked), that would be GREAT, so I don't have to buy these parts, pay to have them installed only to find that they don't work.

I got the 5901 and I definitely love the 2-way feature, but the way its hooked up right now, it doesn't know if the engine is running, only if the brain attempted to start the engine. I can't see my truck when I start it either, so I would love to know if it actually started or not.

Did they set yours up on a fixed crank time, or does it just crank until it sees that the engine is running?
 

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Discussion Starter #9
I'll get you the part number later tonight when I get home.

When I tried to research this originally, I got the impression that it was hit or miss. Some trucks need it and some don't.

Twinjracing:
I did read about more than a couple people who have made it work by getting a signal from somewhere else. My guess is that a professional installer would prefer to buy a purpose built unit for reliability and warranty reasons. Plus, it's probably easier and faster for them than to "keep trying till it works". After all, they aren't paying for the unit, the customer is. Why would they make the install any harder or take any longer than necessary? Obviously, each installer is different and some are much more knowledgeable than others. Maybe my Best Buy installer didn't know how or where to look for a better signal. I'm also willing to bet that diesels scare some techs.
 

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I used to install them at my friends shop And All we did was grab it at the tach. I wouldn't let best buy touch my truck You should of sean the work they did on some cars we had to fix. Fire wating to happen mean any thing. Just like my 08 SD has a dealer installed one it's one of the worst jobs I've ever sean but i can't touch it or it voids warnty. I allways go to the WTS light but the one in my SD is on a 30 sec. timer.
 

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Hmmm... sounds like mist don't have a problem but some do perhaps ... well I'd really appreciate that part number and who makes it... I figure if in going to take it back to have them work on it again I night as well get the adapter, that info will help out a lot!
 

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Discussion Starter #12
Is there any chance you could find out who makes that tach adapter/what the part # was? My installer isn't familiar with this tach adapter, so I need to get the info or the part for him to put it in.

Did they set yours up on a fixed crank time, or does it just crank until it sees that the engine is running?
I used the D.E.I. 454T Alternator RPM Monitor. D.E.I makes the Viper systems so I was pretty confident that it would be compatible.

I believe that the crank time can be adjusted, but I'm not positive. I'm pretty sure that it cranks for a preset time, not just until it starts. I do know that the delay before cranking can be adjusted. This is perfect for diesels because of the glow plugs. Mine was set at 15 seconds before cranking. This has worked fine for me so far. As it gets colder out, I've been keeping an eye on the factory WTS indicator versus the 15 second delay. If I see that the WTS is still on after 15 seconds, I'll bring it in to add more time or just change it myself.

I'm still new to diesels and this will be my first winter rolling coal. After I have one cold winter under my belt I'll feel better about my cold weather morning start routine.
 

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Discussion Starter #13
By the way, I paid $25 for the 454T. It looks like a simple install. It sits on top of one of the alternator wires. It has a power lead that goes to the battery and another wire that goes to the module.

The installer made a point to show me the unit in case anyone else was under the hood at a later time.
 

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I am running a 2008 superduty...on mine there is a CTO (i believe is Clean Tach Output") wire located under driver dash. I am assuming this wire doesn't exist on the 7.3? I am not at all familiar with that truck, but when I inquired about tach signal on my RS install i did myself, the local install shop told me not to use the tach signal from the guage because it was "dirty" per say. I can't say I agree, but I can't argue either.

Also, I installed a Compustar, so I am not sure about the Viper system, but on mine there is options to program the tach signal, which is referred to as a "engine sensing wire", to look at tach, alternator / battery voltage. Also, there is an option to disable the wire all together. If using this, you MUSt use a constant crank time instead of "crank til it starts" i guess you could say.

Curious of the final answer as a friend of mine is debating putting a RS in a 6.0 L which may lead us to a similar scenario.
 

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I used the D.E.I. 454T Alternator RPM Monitor. D.E.I makes the Viper systems so I was pretty confident that it would be compatible.

I believe that the crank time can be adjusted, but I'm not positive. I'm pretty sure that it cranks for a preset time, not just until it starts. I do know that the delay before cranking can be adjusted. This is perfect for diesels because of the glow plugs. Mine was set at 15 seconds before cranking. This has worked fine for me so far. As it gets colder out, I've been keeping an eye on the factory WTS indicator versus the 15 second delay. If I see that the WTS is still on after 15 seconds, I'll bring it in to add more time or just change it myself.

I'm still new to diesels and this will be my first winter rolling coal. After I have one cold winter under my belt I'll feel better about my cold weather morning start routine.
Awesome, thank you very much, I appreciate the info. I ordered the 454T today.

I found the manual online as well, it looks like you have to connect 2 other wires together on it, and which 2 wires you connect together depend on the vehicle, did you by chance notice 2 wires on the 454t that are directly connected together?
 
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