S50 Tach problem in '84 318i

[IrocE30]

OK i have search for an answer and havent got my problem solve so i'm gonna post it up here and see the response.

i have and '84 318i swapped in a '95 s50. i have my tach wire connected from pin 20 on the e36 harness, i have had it connected to the green wire on the three prong connector behind the glove box ( as i have read from some threads), tach doesnt work. i have had it connnected to the black wire on that same connector still no tach. i have had it connected directly to the green coding plug on the back of the cluster as i have also read to do, still no tach. i tested the wire from pin 20 and i have current and my tach work before the swap. i understand that a 6cyl coding plug is required for the tach to read correctly, but it should still move with the 4cyl coding plug, right?

well thats the pickle i'm in. so shoot me some ideas and solutions.
thanks

[328ijunkie]

should go to black on C104. It will still read wrong though as you have a 4cyl cluster.

[Mr.SWISS]

Your wires be wrong yo.



When it starts working it will read over actual. Say idle will read about 1,200 ish. Had the same issue when I swapped my M44 in the Z3.

[IrocE30]

I had it connected to the black wire on the c104 (theconnector in the glove box) does that mean the cluster is bad?

[IrocE30]

Ok been driving car for a while and tach works some times,so i think the cluster may be bad, i'm gonna try to get another one since the temp gauge and fuel guage have never worked before anyway.

[Mr.SWISS]

SI batteries pwn joo

[e30rapidic]

replace SI board...or at least the batteries