Tach Wiring - Alfa Romeo Bulletin Board & Forums
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post #1 of 4 (permalink) Old 02-16-2018, 05:30 PM Thread Starter
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Tach Wiring

I found the following on the BB from 2011:

There are 4 wires on the coil (-).

For fuel there are two wires.

A white/black wire connects the coil (-) to the drive relay, terminal 1 (or terminal 31b) depending on labeling.

A yellow wire with shielding connects the coil (-) to terminal 1 of the fuel ECU

Then two white wires, one to tachometer and the other to the terminal 1 of the ignition ECU.

I'm converting to a carb setup so the ECU(s) have been removed. To make the tach function, any suggestions on the wiring?

Thanks.

1986 Spider Grad (one owner) converted to 1973 2L w/dual Webers in 2018, 2007 Honda Spirit VT1100C, 1980 Honda CX500 Custom, 2017 Triumph Tiger Explorer XRt, 1971 VW Beetle Convertible (complete restoration in progress for the wife)
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post #2 of 4 (permalink) Old 02-16-2018, 05:47 PM
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I don't think the ECU has anything to do with the tach function. So figure out which white wire goes where and keep the one that goes to the tach.

- - Eric
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~ 1984 Spider Veloce ~
- -~ 1981 GTV-6 ~
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post #3 of 4 (permalink) Old 02-16-2018, 07:33 PM Thread Starter
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Quote:
Originally Posted by ghnl View Post
I don't think the ECU has anything to do with the tach function. So figure out which white wire goes where and keep the one that goes to the tach.
Sounds too good to be true assuming I can find the wire. Thanks Eric.

1986 Spider Grad (one owner) converted to 1973 2L w/dual Webers in 2018, 2007 Honda Spirit VT1100C, 1980 Honda CX500 Custom, 2017 Triumph Tiger Explorer XRt, 1971 VW Beetle Convertible (complete restoration in progress for the wife)
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post #4 of 4 (permalink) Old 02-17-2018, 12:57 AM
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thinner of the two whites goes to tach, see Jim's post here:
http://www.alfabb.com/bb/forums/1141601-post3.html
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Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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