Factory Tach with MPI Kit - JeepForum.com
 
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post #1 of 9 Old 07-03-2020, 04:25 PM Thread Starter
jcwhitty
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Factory Tach with MPI Kit

Hello all,

This is a link to a You Tube video where the factory tach is hooked up to an MPI Kit and it works. How is this possible, since my understanding was like his, and which many people have stated on this forum.


I would love to use my factory tach with my MPI kit for numerous, obvious reasons, many of which he states in the video.

Any input would be appreciated.

Thanks, John.


1986 CJ 7 Laredo, 258, 4.0 head, MPI, Borla Headers, Dana 30, 44, 456 gears, Ected lockers both ends, (Ected gone, junk. Now E locker)T5. Dana 300, JB Gears 4:1, Lowrance Baja 540 GPS.
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post #2 of 9 Old 07-03-2020, 05:24 PM
John Strenk
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Yeah, that will work, He's just splicing the factory tach into the wire that supplies power to the coil from the ECU. Just like the OEM tach is wired.

He's NOT using the Tach Signal connection.
You CAN'T use the Hesco tach signal.

You have to do a little surgery.
Look for the plain Grey wire coming out of the ECU
According to him, there are 4 grey wires but only one of them does NOT have a stripe. That is the one you want to use.

Cut it and slice in the factory tach.

Make sure you plan ahead and have enough room to solder in two spices.


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post #3 of 9 Old 07-03-2020, 05:58 PM Thread Starter
jcwhitty
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Thanks John, I will give it a shot! I wanted an opinion, since I don't believe everything I read/see on the internet! Ha Ha

1986 CJ 7 Laredo, 258, 4.0 head, MPI, Borla Headers, Dana 30, 44, 456 gears, Ected lockers both ends, (Ected gone, junk. Now E locker)T5. Dana 300, JB Gears 4:1, Lowrance Baja 540 GPS.
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post #4 of 9 Old 07-03-2020, 05:59 PM
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Take pictures so we can record all the steps for prosperity...


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post #5 of 9 Old 07-04-2020, 12:02 PM Thread Starter
jcwhitty
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Will do......

1986 CJ 7 Laredo, 258, 4.0 head, MPI, Borla Headers, Dana 30, 44, 456 gears, Ected lockers both ends, (Ected gone, junk. Now E locker)T5. Dana 300, JB Gears 4:1, Lowrance Baja 540 GPS.
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post #6 of 9 Old 07-05-2020, 08:39 PM
87MJTim
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I had found the same youtube video. I also found this thread on pirate4x4. You have to scroll down to post #8.

EDIT: The link didn't come through

https://www.pirate4x4.com/threads/4-...to-use.103489/

Tim

87 Comanche, 4.0, AX15 (formerly BA10/5), D44
84 CJ7, 4.0 (93 XJ) AX15 (Formerly T5)
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post #7 of 9 Old 07-07-2020, 10:21 PM
Chrisinchwk
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Quote:
Originally Posted by jcwhitty View Post
Hello all,

This is a link to a You Tube video where the factory tach is hooked up to an MPI Kit and it works. How is this possible, since my understanding was like his, and which many people have stated on this forum.

https://www.youtube.com/watch?v=8yo89HbdgmU

I would love to use my factory tach with my MPI kit for numerous, obvious reasons, many of which he states in the video.

Any input would be appreciated.

Thanks, John.
I had to run mine through a MSD Tach adapter to work, but I'm running a Fitech TB

Chris
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post #8 of 9 Old 07-09-2020, 08:03 AM Thread Starter
jcwhitty
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Well, the outcome of my surgery was a fail. When you rev the motor, the needle does move, but ever so slightly. After doing some additional reading, I have ordered the MSD tach adaptor, and I will see if I can get it wired in correctly. Thanks again for all the input. Will keep you updated.

John.

1986 CJ 7 Laredo, 258, 4.0 head, MPI, Borla Headers, Dana 30, 44, 456 gears, Ected lockers both ends, (Ected gone, junk. Now E locker)T5. Dana 300, JB Gears 4:1, Lowrance Baja 540 GPS.
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post #9 of 9 Old 07-12-2020, 10:20 AM Thread Starter
jcwhitty
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I'm back! So if someone could help me here since my last attempt was a fail, and Chris mentioned that he had used the MSD adaptor successfully, though his fuel injection system was different. My understanding that my tachometer is triggered by current, so I am hoping this adaptor will work. All I need is a few suggestions on how to wire it into my existing MPI system. The MPI kit is modeled after a 95 Wrangler.

Hopefully the instructions are attached.

John.
Attached Files
File Type: pdf Scan Jul 12, 2020.pdf (50.5 KB, 2 views)

1986 CJ 7 Laredo, 258, 4.0 head, MPI, Borla Headers, Dana 30, 44, 456 gears, Ected lockers both ends, (Ected gone, junk. Now E locker)T5. Dana 300, JB Gears 4:1, Lowrance Baja 540 GPS.
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