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Unread 03-03-2013, 07:53 PM   #1
Jevy
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1984 CJ7 
 
Join Date: Sep 2012
Location: Collierville, Tn
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question about wiring up a tach....

Hey everyone,

I am wanting to put a tach on my CJ and have a couple questions. I have a 350 with electronic ignition. I've read quite a bit about wiring one up and understand the switched hot, ground, lights but not very clear on the wiring that actually monitors the rpm's of the engine. From what I've read I connect it to the coil but I'm not quite sure what this means as in where to connect it to. Can I get a little more info on where/how to do that terminal? I'm also thinking of going with a column mounted tach. Any opinions on that as well?

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Unread 03-03-2013, 08:00 PM   #2
78FordF150
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1983 CJ7 
 
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On the top and side of your distributor cap is a square plug end with wires running to it. One of the spade terminals will be marked TAC. Run the wire from your tacomator to the TAC plug.
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Unread 03-03-2013, 08:01 PM   #3
CSP
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Assuming you're talking about an aftermarket tach and not a stock CJ tach, the green wire from the tach goes to the negative side of the coil or the tach terminal if you have a large cap HEI distributor.
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Unread 03-03-2013, 08:07 PM   #4
Jevy
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1984 CJ7 
 
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Location: Collierville, Tn
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I'm looking at some of the 5" auto meter tachs. I also failed to mention my 350 is carbureted and has electronic ignition. Thanks for the help guys I'll look at the distributor tomorrow to check for the wires as suggested.
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Unread 03-03-2013, 08:40 PM   #5
CSP
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You mentioned the electronic ignition. Hookups are still the same as already described depending on what electronic ignition it has. If it's stock for the 350 it will be the HEI and have the tach terminal.
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