I recently tried to install an SPT boost gauge, after getting two replacements and they were both freakin broken outta the box. I decided to go with Defi Red Racer gauge instead(which is what I should have done to begin with). I still have the VAC line ran through the firewall(which is nice to help run wire from the sending unit), I also have the wiring harness still ran through the dash, everything but the crappy SPT gauge.
My question is with the Defi gauge's power supply wire. How have you guys/gals ran this wire and can I spice into the SPT wiring harness somewhere?
Japanese car......SPT gauge made in USA......should have known better!!