laredo tach question - JeepForum.com
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post #1 of 10 Old 06-04-2019, 05:30 PM Thread Starter
98muddyjeep
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laredo tach question

hey everyone been a while since i have been in here but have a question i cant seem to find the answer to even though i googled the hell out of it. i have an 81 laredo that originally had the 4 cylinder but some one pulled it out and dropped in a chevy 250 i guess because it would bolt up to the fly wheel, well they pretty much ran most of there own wires to make it work and it runs great and almost all the gauges works properly, my issue is i want to swap in a factory 6 cylinder tach with a harness i will have to make to replace the factory 4 cylinder tach, on the 6 cylinder tach there are two wires one is red and one is red with a white tracer, what i really need to know is what wire goes where? i dont want to ruin a good tach because it got wired incorrectly any help would be much appreciated.


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post #2 of 10 Old 06-04-2019, 05:39 PM
keith460
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If it is an original OEM 6 cylinder tach, the wires off the tachometer should have the male/female plugs on them unless someone hacked them off.
The red w/tracer off the tach will have a male plug and plug into the red w/tracer with the female plug on wiring harness. Red wire off the tach will have the female plug that plugs into the male plug of wiring harness.
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post #3 of 10 Old 06-04-2019, 05:50 PM Thread Starter
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hey your local to me, but that info doesn't help since the harness under the hood is cut up and it was originally set up for a 4 cylinder tach, i am just trying to find out if i can make a factory 6 cylinder tach work if i made my own harness or tried to wire it to the 4 cylinder tach wires and if so on the latter choice what wires go where?

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post #4 of 10 Old 06-04-2019, 07:03 PM
keith460
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The harness is under the dash on drivers side and not under the hood. Their are separate plugs for the factory 4 cylinder tachometer.
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post #5 of 10 Old 06-04-2019, 11:02 PM
SLO_Ken
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You can probably make it work. The factory 6cyl tach was wired in series with the ignition coil power. So whatever you have going on under the hood, cut the 12V power to the coil, run that back to the tach Red/Tr, then the Red goes back to the coil.

California 4.0 OBDII Engine Swap
https://www.jeepforum.com/forum/f8/california-4-0-obdii-swap-1530716/

Last edited by SLO_Ken; 06-04-2019 at 11:05 PM. Reason: had my wires crossed
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post #6 of 10 Old 06-05-2019, 03:24 AM
momo2
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I could use a good 4cyl tach. If you want to sell it just tell me. Momo

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post #7 of 10 Old 06-05-2019, 04:28 AM
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It doesn't really mater which red wire goes goes to the coil and which goes to the ignition switch, just as long as it is in series.
Hooked up any other way will just short out the ignition.


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post #8 of 10 Old 06-05-2019, 08:45 AM
hp_lovecraft
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THe 4-cyl tach is wired in parallel, while the 6-cyl works in series. Its weird that AMC used different systems.
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post #9 of 10 Old 06-05-2019, 01:05 PM
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Quote:
Originally Posted by hp_lovecraft View Post
THe 4-cyl tach is wired in parallel, while the 6-cyl works in series. Its weird that AMC used different systems.
I never checked but is this true for the GM as well as the AMC 4 cyl engine.? I can see it on the GM engine as they used a form of HEI on it.

Also my 84 Harness had all the wiring for the 4 cyl tach as well as the 6 cyl tach. I guess they figured just one harness was needed that way.


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post #10 of 10 Old 06-08-2019, 11:37 AM Thread Starter
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thanks i got it figure out i had to undo some of the past butchery on the wiring harness and splice in some wires off another harness i had but got it working.

ah,beer the cause of and cure to all of lifes problems ...Homer J Simpson... I am the guy in the red jeep!
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