e30 s52 swap tach mpg temp gauge not working

[corzi]

Guys,

I m just done with my s52 swap on my 1987 e30 325is.

i m running into some problems, the tach, mpg and temp gauge are not working.
I try with an other cluster and same problem.
I m using an akg adapter, do i need to do any other wiring or should it work like that?

let me know if you have any idea thanks

[duval7]

I am having the exact same problem. I have searched and this doesn't seem to be documented anywhere. My fuel gauge works tho!

[knuklehead92]

do you have the e30 temp sensor in the head? it ur temp wont work with stock e36 temp sensor 2 pin plug. do not remove the 4 pin that goes into your ecu. as for tach and mpg there 3 wires in the glove compartment. i had the same issue i just wire those 3 and worked

[chris_rai]

check the board batteries, if it's dead, tach and temp gauge will not work. i had the same issue, because the car was off battery for a long time before the transplant

[duval7]

do you have the e30 temp sensor in the head? it ur temp wont work with stock e36 temp sensor 2 pin plug. do not remove the 4 pin that goes into your ecu. as for tach and mpg there 3 wires in the glove compartment. i had the same issue i just wire those 3 and worked

Yes I have the correct sensor for the coolant; e30 Browntop. I also wired it in correctly, slicing the BR/VL wire to the sensor. What are you supposed to do with the wires at the c103? nobody ever explains what you need to do with the c103 connector wires. Are they spliced into the engine harness?

[knuklehead92]

Yes I have the correct sensor for the coolant; e30 Browntop. I also wired it in correctly, slicing the BR/VL wire to the sensor. What are you supposed to do with the wires at the c103? nobody ever explains what you need to do with the c103 connector wires. Are they spliced into the engine harness?

ill check my car. its been a while since i looked it

[duval7]

So my temp gauge is working, i finished bleeding the cooling system and it eventually started to come up. I dont know if my speedometer is working as i havent been able to properly bleed my clutch and actually drive it, but my tach is definitely still not working.

[328ijunkie]

Akg adapter doesn't encorporate a c104. You need one

[NickL]

^ tach needs wired through the c104

[duval7]

How is it wired through the C104? Does a wire from the engine harness need to be spliced into a wire from the C104? If so which wires? Thanks for the help.

[hooken m]

hey man for my tach to work theres a black wire that you need to connect to your c104. for me it was a black wire from the x20 (pin 8, not 100% sure) to the black wire on the c104 and my tach works

[duval7]

hey man for my tach to work theres a black wire that you need to connect to your c104. for me it was a black wire from the x20 (pin 8, not 100% sure) to the black wire on the c104 and my tach works

Where is the C104 located? Thanks.

[NickL]

Its a white three pin connector in the glove box.

that's exactly how mine is hooked up - sans any issues

wire that goes to pin 24 on the x20 goes to the red/yellow wire of the c104
wire that goes to pin 14 on the x20 goes to the black wire of the c104
wire that goes to pin 20 of the x20 goes to the wire on the back of the instrument cluster in the circuit board with the green covering that snaps onto the cluster.

[duval7]

I dont think mine runs through the C104, from the ETM it looks like it goes through the C101 to the back of the cluster. Is that what you guys see in the diagram below? Also I cant find a three pin connector in that area. I had read that the C104 is on later models.

[NickL]

Did you have a pin 8 and 9 on your body side E30 c101? If so, then you are wired through the C101. If not, its through the C104.