Tachometer wiring

horse · Posted: Sat Mar 25, 2023 10:38 am Post subject: Tachometer wiring

How would you wire up a Tacometer to the M38?
I have the full waterproof 24v system.
I notice the Plug part number 73748888 on the Auto-Lite Distributor cover assembly could be removed and gives access to the coil I think?
I would like to set the tick over a bit more accuratly, I have been using a inexpensive Laser type gun on the Crankshaft nut which works okay but fluctuates a lot.
It will not be a permanent fixture just used for tuning up.
Any ideas would be appreciated.
Horse.
_________________
1952 M38

RonD2 · Posted: Sat Mar 25, 2023 10:54 am Post subject:

Hi Horse,
I think having one of these 24V military adapter kits would solve your question.

http://willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=8710&highlight=adapter+kit

http://willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=12242&highlight=adapter

Good luck!
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

horse · Posted: Sat Mar 25, 2023 11:06 am Post subject:

Thanks Ron, that would be a nice kit to have.
Any other way around the problem until one pops up at a reasonable price?
Horse.
_________________
1952 M38

wesk · Posted: Sat Mar 25, 2023 11:06 am Post subject:

Same way the Army did.

These adapters can be used easily with both military test sets and civvy test sets. Just follow the directions for test connections of the Dwell/Tach you are using and employ the appropriate military harness adapter. Same with timing lights and coil test sets.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

wesk · Posted: Sat Mar 25, 2023 11:11 am Post subject:

Horse said:

horse · Posted: Sat Mar 25, 2023 11:13 am Post subject:

Thanks Wes, will keep an eye out a good bit of kit to have.
Horse
_________________
1952 M38

wesk · Posted: Sat Mar 25, 2023 4:06 pm Post subject:

What brand model dwell tach are you using?

Here's another helpful Publication from PS magazine: chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/http://willysmjeeps.com/downloads/24%20Volt%20Electrical%20Equipment%20Testing.pdf
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

horse · Posted: Sat Mar 25, 2023 4:13 pm Post subject:

I have not bought one yet as I did not know how to wire it.
Open to advice on that as well.
Horse
_________________
1952 M38

wesk · Posted: Sun Mar 26, 2023 12:35 am Post subject:

I have used a Military Simpson for many years and got used to it. I also have civvy Dwell/Tachs from Craftsman and Sun.

You can download and review test set handbooks here:
http://www.willysmjeeps.com/v2/modules.php?name=Downloads&d_op=viewdownload&cid=57
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

horse · Posted: Sun Mar 26, 2023 1:15 am Post subject:

Thanks for the information.
I will check out the suggested units and see what is available over this side.
Horse.
_________________
1952 M38

horse · Posted: Sun Mar 26, 2023 5:30 am Post subject:

Bit of a result.
One of my old timing lights has a switch to show RPM which I had forgotten about, so all is well again.
I will still look out for the military kit.
Horse.
_________________
1952 M38


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