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HOWEVER, I need you to check everything to see that I did it correctly. And, I need to fill in some details, most of which are shown on that page in red:
I need good pics of the front and rear of a 6000 RPM "open" tach like our trucks would have
Whomever had the 4500 RPM gas tach, can you tell me what the first 4 characters on the face are? I cannot read them.
I need good pics of the front and rear of a 6000 RPM "open" tach like our trucks would have
Whomever had the 4500 RPM gas tach, can you tell me what the first 4 characters on the face are? I cannot read them.
Whatever else I missed
Upgrades, please.
On the first post of the first page David wrote under the details of the 4500 tach:
"On the face in the lower right hand corner is: EOTF-17B316-B"
I mailed that tach back to David but I believe that is the info you needed.
And pics of an open style 6000 rpm tach? Guess what I just found in more boxes of ford-junk-that-I-couldn't-leave-at-the-junkyard...
(This unit has your name on it if you need it Gary)
Edit:
The markings on the face read EOTF-17B316-A
The markings stamped in ink on the back read E6TF-17360-AA
Here is a better picture of the back of the early style diesel tach with the spring nuts removed. This verifies the two partially covered numbers are "60" as you extrapolated:
Possibly a better visual example of open vs. closed type tachs??
And finally an additional bit of information on the 3500 rpm tach unit. You are correct, there are NO markings on the face of the tach, however there are markings on the back of the face piece, behind the "0" rpm position of the face plate. That marking reads: E0TF-17B316-D
I added your pictures as well as the info you provided. And, I added a "Summary" section up front trying to pull together all the info that was floating around. Please let me know what you think. This is our page.
I added your pictures as well as the info you provided. And, I added a "Summary" section up front trying to pull together all the info that was floating around. Please let me know what you think. This is our page.
The page looks GREAT Gary! Thanks for compiling all of that. The only correction I have is that the open style 6000 rpm tach face has the marking E0TF-17B316-A just like the closed style, not E6TF..... So you can't tell from the front unfortunately. I now have an "eye"for the faded needle colors but let's not go there! The E6TF was the engineering number prefix for the whole tach unit and was stamped on the back.
I thought I read that the engineering number referred to the first year the part was used E0TF for the 6000 tach first available in 1980, E5TF for the 4500 diesel tach which first appeared in 1985...
Do you have a 6.9 tachometer wiring diagram? I have one for a manual transmission 7.3 which "gets you there" but we have different warning lights and the cluster pins are surely different. At some point I will try to get pictures of the early 83/84 injection pump gear housing and the later 85/86 housing with the tach port. These items might be helpful for someone trying to add a tachometer to a 83/84 diesel. It is probably outside the scope of your web page but good info to have in this thread which is linked to it
Again, thanks for all the work you put into it. The page looks great!
Jonathan - Good catch on the error. Thanks! The page has been updated. I suspect that the E0TF-17B316-A is the # for the face and that they used the same face for the open as well as enclosed varieties. Similar to what I think they did with the enclosure, E0TF-17360-Y, which seems to have been used in both gas and diesel versions.
But you said, I think with respect to the 6000 RPM open tach, "The E6TF was the engineering number prefix for the whole tach unit and was stamped on the back." I've been looking at the pictures of the backs of the open tachs but haven't seen the E6TF nor any other recognizable part numbers. Could you point that out to me?
And, speaking of E6TF, my understanding is basically the same as yours with the exception that it was the "engineering" date. So, it could have been engineered one year and not used until the next. Still, it won't have been used prior to the date the E6 decodes to, but may have been used for many years thereafter.
Today the mail man brought me a cool surprise... David sent me a 4500 tach, presumably the non-diesel one with no yellow or red zones on the face. It is cool to see these unusual parts in person. Thank-you David for this museum piece!
Here is yet another variant of the gas burner 4500 RPM tachometer... notice the unleaded fuel only on the face. This if from a later model truck. It is the "open" type.
Here is yet another variant of the gas burner 4500 RPM tachometer... notice the unleaded fuel only on the face. This if from a later model truck. It is the "open" type.
This is interesting David, also notice that it only has three terminals on the back. It looks to me like the 8 cylinder ground terminal is deleted, as if it is circuited for only 8 cylinder engines, not 8 or 6 depending on the grounding. Bad news if you are looking for a low rpm tach for a 300 I6 pick up truck
But you said, I think with respect to the 6000 RPM open tach, "The E6TF was the engineering number prefix for the whole tach unit and was stamped on the back." I've been looking at the pictures of the backs of the open tachs but haven't seen the E6TF nor any other recognizable part numbers. Could you point that out to me?
My bad. I thought I took a picture of that but I did not. It is faint on this particular tach, and hard to make out. I did the best I could with the picture. Pardon the pant leg! Doing this on a break at work.
Gary, one other thing I noticed throughout this thread is that where the E0TF prefix is written, sometimes it is written as an upper case "O" instead of a zero "0". No big deal when reading but search engines will pass it by. If you are making your website searchable you might double check the text to see if any of yours are that way. Unfortunately I think most of the posts in this thread are too old to edit.
Jonathan - Thanks for catching the O vs 0. I found one O on my web site and fixed it. And, I typed out all of the #'s in text because search engines can't find #'s in pictures, and all the tables are actually pictures of tables. Also, I have the #'s in the meta words that search engines are supposed to use. So, hopefully the page will be found.
As for the # on the back of the open tachs, I hadn't seen that before but see it now. Where is that? I'd like to tell people where to look.
That is on the reverse of the face plate on the left side as viewed from the back, behind the 6,000 rpm hatch mark so to speak. I will check my open diesel model and see what it has and post the results.
03-30-2016, 12:46 PM
The E6TF was the engineering number prefix for the whole tach unit and was stamped on the back.
