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New Tach not working correctly - assistance needed #2439646
01/23/18 05:53 PM
01/23/18 05:53 PM
Joined: May 2005
Posts: 581
Texas
Texican Offline OP
mopar
Texican  Offline OP
mopar

Joined: May 2005
Posts: 581
Texas
Hooked up a new tach on my 70 Charger (New Restoration - Engine just broke in)

Referring to the photo below, can you please comment on how it should be wired up using an original Mopar Tachometer wiring harness ?

Note: I am using a Mopar Electronic Ignition (Orange) ECU with a standard coil.

Thank You
Mike

IMG_1402.jpg
Re: New Tach not working correctly - assistance needed [Re: Texican] #2439731
01/23/18 09:19 PM
01/23/18 09:19 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
Circle Track
Happy Birthday RapidRobert  Offline
Circle Track

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
A tach pretty much just needs the switched 12V feed, a ground, the wire to power the light bulb in it, likely an orange wire to it and the sense wire out to the black/yellow wire on the coil neg primary terminal which is what the tach reads. Not sure if this OE type tach needs an additional sending unit or not but here is a BTT for ya. EDIT the diagrams at www.mymopar.com might show the tachs' connections MORE EDIT it shows a dark blue (switched 12V) & the sense wire, couldn't make out the color, looked like green/yellow but that don't sound right.

Last edited by RapidRobert; 01/24/18 12:37 PM.

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