do you have AC/ in truck Does your truck have AC/ if not then it will not be vac, it would be cable for the heater box under dash.
if full gauges yes you can swap out the speedos but some may read in K/m after 81 in the usa or if it's from canada and has 7 digits it K/m if...
GM did have some the time I looked but that about Two yr ago GM dealer might still have some on the shelf, LMC http://www.lmctruck.com...
vin frame ok for the vin on the frame, it's on three places one place is right top under cap this seam to hold up the best if you can read it...
73-75 Gauges 76- 87 gagges different OH the volts is for the year76 and up, AMP gauge would be in 75- 73
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