Tach wire

Technical Question and Answer - On topic to 71-74 Plymouth B-bodies only.

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PLUM BAD
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Tach wire

Post by PLUM BAD » Thu Jan 06, 2011 12:40 am

I have a reproduction tach and wiring harnsess that I am installing in a 72 Roadrunner. I cannot find any information on where the harness comes through the firewall. If anyone has a picture of the location, that would be great. Thanks.
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ILUV72RRs
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Re: Tach wire

Post by ILUV72RRs » Fri Jan 14, 2011 6:24 pm

I checked with my friend today who restores Mopars. According to him. A '71 & '72 Road Runner if it came from the factory with a tach. The tach wire was part of the wiring harness that came out of the firewall into the engine compartment. The E-bodies came with a separate wire that was a separate plug through the firewall. Yeah, I know. Just what you didn't want to hear. :rant:
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Re: Tach wire

Post by moparite » Sat Jan 15, 2011 12:01 pm

Does the harness you are using on the car have the factory tach? I guess not seeing the rant smilie. I'm not so sure of the firewall wire on the Chally. I think both came through the bulkhead connector on the firewall. I'll have to look at mine. You can add the wire to the factory harness if it wasn't there. You need a donor harness though.
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PLUM BAD
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Re: Tach wire

Post by PLUM BAD » Sun Jan 16, 2011 12:43 am

Thanks for the replies. I'm using a reproduction factory tach. I was looking at the '72 Service Manual. It shows a separate harness. I'll keep investigating.
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71_DEPUTY
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Re: Tach wire

Post by 71_DEPUTY » Thu Jan 20, 2011 9:12 pm

plum- it should be in cavity # 20 that is the bulkhead connector which is part of the engine harness.
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71440 gtx
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Re: Tach wire

Post by 71440 gtx » Fri Jan 21, 2011 1:41 am

1971 tach wire in cavity # 20 that is the bulkhead connector which is part of the engine harness.
1971 chassis service manual

in 1972 it dos not go in 20 bulkhead connector

it came with a separate wire that was a separate plug through the firewall.

1972 chassis service manual :beer:
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