Help for the electrically unsure, New injection system |
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Help for the electrically unsure, New injection system |
jmargush |
Apr 13 2022, 04:33 PM
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#1
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Member Group: Members Posts: 460 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
I am in the process of installing a CB Performance Injection system with crank fire ignition.
This requires a module to run the Tach of off low voltage, so I have to buy a module to convert the signal form the ECU. The instructions say I need a 12 volt power wire that comes form one side of the ignition switch to the tach. Then I also need a wire that eventually goes to the ecu, I assume this would be the existing wire that drives the Tach? Then a ground Can anyone help me by telling me which wires on the back of the tach correspond to these functions? I assume #3 BRWN is ground Attached thumbnail(s) |
Retroracer |
Apr 13 2022, 10:14 PM
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#2
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Senior Member Group: Members Posts: 612 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest |
Comments added around your text:
The instructions say I need a 12 volt power wire that comes form one side of the ignition switch to the tach. red wire to tach Then I also need a wire that eventually goes to the ecu, I assume this would be the existing wire that drives the Tach? thats the black (black / purple?) sender wire that goes back to the relay board Then a ground that'll be the brown wire hope this helps. The wires at the top portion of the tach are illumination and hi beam indicators - you won't need to touch those. - Tony |
Dave_Darling |
Apr 13 2022, 10:19 PM
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#3
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
On the 914, the ECU does not drive the tach. (The 1.8's L-Jet injection does use the tach signal to tell it when to open the injectors, though!)
The red/white wire is switched power. The brown is full-time ground. The black/purple (look carefully on your black wire, there is a faded purple stripe!) carries the points signal to the tach. The stock tach uses the open/closed signal from the points to move the needle. It is likely that is what the adapter uses as a signal as well. --DD |
jmargush |
Apr 14 2022, 05:14 AM
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#4
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Member Group: Members Posts: 460 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
Thanks so much guys. One more item to check off!
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