Actually, you don't have to use magnets on the harmonic ballancer, the notch in there is sufficient to break the magnetic field, also I would forget about the alternator mount. I know what you want to do, :thumbsup same thing I did, check out pictures of my truck on my truck profile, I have a couple of my gauge setup, I am sure you will have questions, ask away!!:thumbsup
Adam
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1984 Chevy K30, 4 door, 6" lift, 5.9 215 hp cummins.

4" strait piped, NV4500, NP205 with twin sticks, GV OD. 4.10 gears, leather seats, 12 autometer gauges, pw, keyless entry, walnut trim. '97 dodge 2500, 5spd, 4x4.