tach wire hookup options

q. What wire, on the back of the tachometer, should the tach output run to?

A. 85.5 and later is the green wire with thin black stripe.


Also-


The tach wire is the Red/Blue wire on pin 2 of the T1 connector (in pasenger footwell). Do not confuse this with the Red/Blue wire on the t21 connector (it is for fuel injectors).

I connected the Red/Blue wire to C105-G from my LS1 and the tach works perfect.

Which of these is T1?



Also, neither one has red/blue or green black in the pin2 position. The lower one has a green/black but it's in pin 7 I think.

endrnet dont you have a S? if so that explain the extra 14 pin and we can tell you what it is

Don't think so, no "S" badge.

If i remember right, I was told to use the blue and green or green and white. cant remember which one. have to look it up on the fourm.

ok so here the edit,
searched and this is what i found

http://944hybrids.forumotion.com/lsx-conversions-f3/lsx-tach-hook-up-t138.htm?highlight=tach

Just to document this somewhere, I was looking for the CEL wire from the DME (seems non-existent) and found the red 4 pin plug. This is where that green and black wire comes in. To my understanding, the connector grew in size when going to the 16v motors, so keep that in mind. This wiring diagram is based off of an '86 turbo.



This is the connector I yanked from the stock engine harness. The green and black wire connects to the PCM tach wire. Removing the other pins is very easy with this connector.