Where to route my temperature and oil wiring for my guages ?

[First Pooy]

I have been looking for a good place to route my wiring for my guages,oil,temp,boost and battery, I want to mount the gauges on top of the dash centre,so I thought of drilling a hole in the firewall but there is a lot of think under lay to get through the next idea was running through with the heater lines but I am not sure I want the heat on the wiring

[Hodge]

What car mate ?

GU Y61s have the big wiring grommet passenger side bottom. Pops inside the cab near the kick panel .
Drivers side has several grommets as well for example the idle up cable grommet.

I wouldn't run cables up against heater lines.

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[mudski]

Where the main engine bay harness enters the firewall almost dead centre there you can pass a few wires through. I made a new hole in mine about an inch in diameter, put a rubber grommet in the hole then a copper sleeve right through the grommet and used sikaflex to hold that sleeve in. Then I put a length of convoluted tubing on the engine bay side to the sleeve and also sikaflexed that onto the sleeve. Now I have an extra point to run wires into the cab. Only issue now that its full.

[94patrol]

I have run mine via the rubber gromet on drivers side firewall and then up the A pillar. Gauges are mounted on a three gauge pod and then the pod is mounted onto the A pillar