The copper in the ribbon on the left side of my cluster (temp guage side) recently pretty much disintegrated {I suspect some moisture got in when the car was sitting due to a fault heater valve}.
I went to hook up the tach as a stand alone item- but got a dead response.
My understanding is that the connections are as follows:
Brown wire: ground
Black wire: ground pulse signal
Green wire: positive connection
However, when I plug my tach in, it is not moving.
I am getting a signal to the wires.... the green/white does pass through the temp guage side of things but I {perhaps mistakenly} don't think it should make a difference with the tach.
Is the tachometer not supposed to work on its own? Assuming I am getting correct signals to green, black, and brown wires, Is my tachometer just suddenly broken? Is there something that goes bad in these items?
Any input appreciated
Tachometer - what are the necessary connections
- Peter Florance
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Tach will work by itself.
It will work either from coil negative or just 12v pulse signal (I'm running LS2 coils on my e12 and had to generate my own tach signal(
It will work either from coil negative or just 12v pulse signal (I'm running LS2 coils on my e12 and had to generate my own tach signal(
Peter Florance
First Fives.Org - The E12 Registry
1981 E-Street Prepared Euro BMW 528i w/3.5L & Megasquirt Fuel Injection
http://www.firstfives.org
mailto:peter@firstfives.org
First Fives.Org - The E12 Registry
1981 E-Street Prepared Euro BMW 528i w/3.5L & Megasquirt Fuel Injection
http://www.firstfives.org
mailto:peter@firstfives.org
- Peter Florance
- Site Admin
- Posts: 527
- Joined: Tue Jul 25, 2006 8:32 pm
- Location: Virginia Beach VA
- Contact:
Be sure you have it connected correctlyCBradio wrote:Thank you Peter.
I am getting good voltage to brown and green wires,
with a pulse from the black wire.
So I am assuming I killed my tach somehow.
Will update when I get another.
1 - black
+ green
The other terminal (can't remember label) is brown
Peter Florance
First Fives.Org - The E12 Registry
1981 E-Street Prepared Euro BMW 528i w/3.5L & Megasquirt Fuel Injection
http://www.firstfives.org
mailto:peter@firstfives.org
First Fives.Org - The E12 Registry
1981 E-Street Prepared Euro BMW 528i w/3.5L & Megasquirt Fuel Injection
http://www.firstfives.org
mailto:peter@firstfives.org
Tachometer - what are the necessary connections
I only see positive and negative markings on the tachometer, just want to be sure that the black wire goes to the negative post (left) facing the instrument or (right) if you were looking at the back.. Thank you.