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What you propose to do is similar to a portion of the installation of a boost gauge on a turbo model. As for access to the "Pass Thru", see the instructions at www.volvospeed.com. Once at the home page, click "enter", then select "Modifications" on the left side of the screen, then scroll down to and click on "VDO Boost Gauge". You will see some valuable illustrations there, as well as an important notification, since you have a S70:
Note: On S 70 and C 70 the engine side pass thorough is found under the main fuse box.
However, the instructions concerning working the tubing through the "pass thru" wouldn't work for me ......
So, below is quoted an excerpt from my "Lessons Learned" which I drafted following my boost gauge installation. Hope it helps:
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Let's begin with passing the 1/8 inch tubing through the fire wall by use of the pass-thru. You can see that there is a rubber cap on each end of the pass-thru, and each has four rubber nipples of different lengths. At first, I wondered if this meant that there were 4 separate tubes in the pass-thru and that the different lengths of the nipples were a means of locating the correct entry/exit of each tube. I found that this was not true when I removed the entire cap from the pass-thru in the engine compartment and looked down the pass-thru. Knowing this, I could see that the Volvospeed directions to merely snip the end off the nipple on each end and pass the tubing would never work; going "in" would be easy enough, but finding the correct "out" on the other end would be impossible, even with a straight piece of 1/8 inch vacuum tubing, let alone the actual coiled tubing which would resist a straight pass. So, I removed the cap from the engine side, snipped one nipple on the driver's footwell side, and threaded the tubing into the nipple, hoping to push it through to the other end on the engine side, then thread it through the engine side nipple, then reinstall the cap on the pass-thru. Sounded great in theory, but the coiled tubing would not cooperate. One set of instructions warned of this and advised twisting the tubing while feeding it into the tube. I tried that, but working in that small area of the footwell with sweaty hands trying to twist such a tiny tube was almost impossible. Adding to the problem was the fact that the pass-thru was ribbed internally, so the tubing tended to curl and hang up on the ribs. I could see that I was going nowhere, so I devised a solution. I found some flexible plastic tubing in my garage with smooth walls. The OD of this tubing was just smaller than the ID of the pass-thru, so I fed that tubing down the pass-thru from the engine side until it bottomed out on the footwell side. I fed the 1/8 tubing into the cap in the footwell and felt that it was now inside the smooth plastic tubing as well. The natural coil of the 1/8 tubing would still be a problem, so I placed some …. (ahem) ….. personal lubricant ….. "AstroGlide" (available in most drug stores) …. into the smooth tube from the engine side. Then, it was relatively easy to push the 1/8 tubing thru to the engine side, slide out the smooth tubing liner, and refit the rubber cap.
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Good Luck. Let us know how it goes.
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Dave in Virginia; 98 V70 T5(M); 98 V70; 88 245 DL; 67 MGB
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