I've recently built my first MS, and I've got the car up & running. I'm noticing some sensor noise on the wells 201 tps I spliced in, and the LC-2 WB seems to be reading ~.4:1 leaner in tunerstudio than on my dash gauge. These both seem like grounding gremlins, so I'd like to ground them both to the MS & see if things improve. Currently, the WB is grounded to the engine block at the same post as the ECU. The TPS is grounded... wherever the OEM sensor grounds.

my plan is to use the DB15 connection & ground to the board. However, I only have one SG location remaining on the board (the other two are being used to connect to the jumper board). Additionally, the LC-2 has only a single ground wire, which I'm assuming includes both heater & signal grounds. should I run the tps ground to SG, and the LC-2 to a common GND on the board, or should I try to cram them both into the last remaining SG location?

 

hmmm... upon further internets, I find this statement from the link below:

"NOTE: Do NOT connect the BLACK wire from the LC-2 to the ECU's sensor ground. You will damage the ECU's sensor ground track if you do this."

https://www.ecmtuning.com/wiki/lc2install