Wires run directly back to the computer located next to the glove box, I've been thinking of cutting one, extending it to a switch and running it back. All under the dash, no holes to drill through the firewall. Just haven't gotten to it yet and still haven't confirmed that interrupting 1 wire will cause the engine to shut down. If you are more motivated than me please forge ahead and let us know how it works out.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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