Sup guys

I want to confirm if this is correct. (this is how I connected my relay board to MS and sensors)


INJ 1: ground to injector 1
INJ 1: ground to injector 3
INJ 2: ground to injector 2
INJ 2: ground to injector 4
FP: empty
FIDLE: empty
S1: empty
S2: empty
S3: empty
S4: empty
S5: empty
Vref: empty (???)
TPS: wire to throttle position sensor
TPS ret: empty (???)
Tach: to crank position sensor (blue/white) (???)
MAT: wire to GM intake air temp sensor
MAT ret: wire to GM IAT sensor ground
CLT: wire to GM coolant temp sensor
CLT: wire to GM coolant temp sensor ground
O2: connect to a 470ohm to LC-1 WBo2 sensor
Injector +12V: to positive of all injectors


Below are the questions I have:

1)LC-1 WBo2 sensor ground to MS ground wire? or should I wire it to CLT/TPS/MAT return wires? (coz I thought those goes to pin19 sensor ground)

2) Do I need to get the ground wire for TPS also? coz I only tapped the signal wire not the ground wire.

3) Do I connect the IAT to MAT?

4) And is Tach for the crank position sensor wire?

Thanks guys!