I believe the coil is for heat also... A orfice is used to keep the gauge from bouncing, which could be accomplished with using small gauge copper tube or weld and drill a fitting.
I used my up-pipe egr port. When I deleted the egr I built a 1/4" plate & drilled & tapped it. Alas I haven't hooked the gauge up yet...
I used my up-pipe egr port. When I deleted the egr I built a 1/4" plate & drilled & tapped it. Alas I haven't hooked the gauge up yet...