70Turbo-Fire Posted October 12, 2020 Share Posted October 12, 2020 Can anybody with a 70 Monte (Van Nuys build) with the U14 gauge cluster please tell me where the brown tach wire/grommet should go through the firewall? I'm upgrading from warning lights to the U14 gauge cluster and just want to confirm the firewall location before I start drilling. I was able to confirm the same location above the accelerator cable for a 70 Flint and 71 Baltimore, however, a friend's 70 Chevelle (Arlington build) uses a different hole. See below pics. Thanks, Kurt Quote Link to comment Share on other sites More sharing options...
stangeba Posted October 12, 2020 Share Posted October 12, 2020 I drilled one here for my 71 Oshawa built 350 4BBL, No A/C and it fit fine. I think there was a dimple, long time ago...... Good luck! Bruce Quote Link to comment Share on other sites More sharing options...
Dtret Posted October 12, 2020 Share Posted October 12, 2020 IMO. I would go through any existing hole that has a plug in it. The cluster your going with is not original to the car so why drill any more holes in a very clean firewall. If you were to go back to original you would than have an extra hole to plug. Like I said IMO. Quote Link to comment Share on other sites More sharing options...
1970mcss Posted October 12, 2020 Share Posted October 12, 2020 It looks like the brown wire is going throw the correct grommet. What is the wire above the cable? Quote Link to comment Share on other sites More sharing options...
70Turbo-Fire Posted October 15, 2020 Author Share Posted October 15, 2020 Thank you to everyone for your responses... I'm leaning towards drilling the grommet hole at the "dimple" spot above the accelerator cable which is same for Flint and Baltimore. The assembly manual appears to confirm this, although it is hard to read. I considered using an existing hole for just the wire, but would hate remove the grommet and not utilize it. I would be very appreciative if anybody with a 70 Monte (Van Nuys build) could confirm where their tach wire is routed. The wire wire - harness above the accelerator cable is the TH400 kickdown switch harness (RPO M40). Quote Link to comment Share on other sites More sharing options...
Andy's Auto Posted October 19, 2020 Share Posted October 19, 2020 I feel for the guy who used a green wire pulled through the tach grommet. This is my old L78 4 speed 70 Chevelle. Baltimore car. Quote Link to comment Share on other sites More sharing options...
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