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Old 05-19-2019, 05:05 AM   #1
anotero
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Ignition Coil to Tachometer Connection!

I got a sequential shift light that needs to be connected to an ignition coil. I am very bad with electrical components and have no idea how to connect the shift light to read the ignition coil signal to then translate it to a tachometer reading. All I know is that it needs to be connected to the negative coil terminal. How do I find the negative terminal? Do I need to splice any wires? How do I get to the negative coil terminal?
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Old 05-19-2019, 08:50 AM   #2
Finglonga
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There is no single ignition coil, there is one on top of each spark plug. A single coil is a thing of the past, no car uses a single coil now they are like the golf or have a coil pack that is 4 separate coils (or more depending on engine) in one pack.
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Old 05-19-2019, 08:59 AM   #3
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Have you asked in the Mk7 facebook group?
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Old 05-19-2019, 11:28 AM   #4
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Open the wiring harness above the coil on Cyl 1, the large brown wire is the tach signal wire for the dyno. My guess is it will work for a shift light also.
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Old 05-19-2019, 11:43 AM   #5
Golf7RR
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Quote:
Originally Posted by anotero View Post
I got a sequential shift light that needs to be connected to an ignition coil. I am very bad with electrical components and have no idea how to connect the shift light to read the ignition coil signal to then translate it to a tachometer reading. All I know is that it needs to be connected to the negative coil terminal. How do I find the negative terminal? Do I need to splice any wires? How do I get to the negative coil terminal?
I followed this from another user on cylinder#1 and purple/green wire and for the most part works. however when really getting on it while driving and above 5.5k rpms or so the lights think the rpm is higher than what the dash shows. it doesnt do this is you sit and rev. If you find a better wire to tap please let me know.
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Old 05-19-2019, 04:01 PM   #6
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Delete.

Last edited by anotero; 05-19-2019 at 05:55 PM.
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Old 05-19-2019, 05:50 PM   #7
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I followed this from another user on cylinder#1 and purple/green wire and for the most part works. however when really getting on it while driving and above 5.5k rpms or so the lights think the rpm is higher than what the dash shows. it doesnt do this is you sit and rev. If you find a better wire to tap please let me know.
What shift light do you use?
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Old 05-21-2019, 03:50 AM   #8
Golf7RR
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What shift light do you use?


Ecliptech. You?


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Old 05-21-2019, 02:35 PM   #9
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Ecliptech. You?


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Same. How much off is it from the dash tach reading?
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Old 05-21-2019, 11:36 PM   #10
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Same. How much off is it from the dash tach reading?
Around 5.5krpms it was reading more like 6500 which is where i set it to stop and all lights to flash. but it doesn't occur when say you are in neutral and rev while parked. maybe there is some sort of interference since the wire i showed you to the actual unit it pretty long and it might "pick-up" electrical noise depending on how it is routed. i haven't actually scoped the line so i do not know how large the pulses are and/or how prone they are to noise..But for that theory to hold it should happen regardless of the car being parked and revving or getting on it while driving. well there are lot of settings and its new to me so i'll have to try to figure it out.
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Old 05-21-2019, 11:45 PM   #11
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Around 5.5krpms it was reading more like 6500 which is where i set it to stop and all lights to flash. but it doesn't occur when say you are in neutral and rev while parked. maybe there is some sort of interference since the wire i showed you to the actual unit it pretty long and it might "pick-up" electrical noise depending on how it is routed. i haven't actually scoped the line so i do not know how large the pulses are and/or how prone they are to noise..But for that theory to hold it should happen regardless of the car being parked and revving or getting on it while driving. well there are lot of settings and its new to me so i'll have to try to figure it out.
Interesting. I'll test it out too once I get it. How long did it take yours to arrive from Australia if that's where you bought yours?
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Old 05-22-2019, 12:35 AM   #12
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Interesting. I'll test it out too once I get it. How long did it take yours to arrive from Australia if that's where you bought yours?
shoot i forgot, wasn't too long though. check the tracking#.
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Old 05-22-2019, 12:56 AM   #13
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I picked up this one and plan on installing it with the wire on top of the 1st cylinder.

https://www.ebay.com/itm/4-Stage-Seq...53.m1438.l2649
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Old 05-22-2019, 01:13 AM   #14
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I picked up this one and plan on installing it with the wire on top of the 1st cylinder.

https://www.ebay.com/itm/4-Stage-Seq...53.m1438.l2649
nice!! which wire? the wire in the photo i showed? if not, please share details.
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Old 05-22-2019, 01:17 AM   #15
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nice!! which wire? the wire in the photo i showed? if not, please share details.
I believe its the same wire, the one I bought is programmable so I'll have to play with with it and see if I face the same issues as you.
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Old Today, 10:44 PM   #16
anotero
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shoot i forgot, wasn't too long though. check the tracking#.
Did you buy additional wire and solder it to the ones that come with the light? Mine certainly won't reach the coils.
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