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06-18-2005, 12:32 AM
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Senior Member
 
Join Date: Apr 2001
Location: Alexandria, MN
Posts: 1,462
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im back... but now weird fact tach issue
well now that school is out, I finally hve a little more time to work on my truck than on my kids' grades... SO I went out to hook up my fact tach cluster (74 c70 tach/vac) and using the fact harness, plugges everything up and the tach reads backwards... to explain, it idles at a beautiful 4200 RPM and revs counterclockwise perfect!!! i know... weird... so i took a tach out of one of my other clusters (79 standard tach) and plugged into same harness and that one works fine.. idles 800, yadayadayada... since i have yet to find another 73-75 tach with the fuel gauge (which works by the way) i almost hate to switch any coil, 12V, or ground connections for fear of REALLY toasting the tach... any electronic gurus out there, i know i saw a post ott one time about someone changing the tach calibration to read 0-8000 RPM, and i wonder if that person or people understands the electronic stuff of the tach.. I did have two semesters of electonics in undergrad, but i dont seem to have any old notes pertaining to tach operation... any suggestions???? crossy or jeff???
==Mike
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63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's Last edited by tkeduk8r; 06-18-2005 at 12:33 AM. |
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