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11-06-2009, 05:28 PM
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Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 735
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Tachometer Calibration/Adjustment ??
Even with all these old Chev and GMCs hangin' around here, never had one with a factory tach except the mechanically driven 67 Corvette. So - is the 67-72 truck tach the same - mechanical - or is it or electronic, and how does a guy make it accurate?
This one feels to be running (guesstimate) about 50% to 70% higher than actual revs. Is this a reasonable/logical fix (gear, cable, etc.?) or a pain? Thanks for any info and help. CCCC
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CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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