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I don't know if anyone is still compiling information on the Tachometer numbers, but here is an input:
From a '73.5 CIS car --
230/41/10 12V/24000 Imp. 4.73
From a '77 --
231/1/1 12V/24000 Imp. 10.77
From a '78 --
231/1/5 12V/21000 Imp. 12.78
With a '79 SC engine transplant into the '73, the '79 CDI box won't drive the '73 tach. I suspected this would probably happen, but thought I verify that it wouldn't work before removing the tach from the dash. I didn't bother to check out the '77 tach to see if it would work, since I had an SC tach available.
As another data point, I can verify that an SC tach will work with the 3.6 liter DME. Or at least it did with the tach in the particular SC I installed the 3.6 engine in.
__________________
Jim
www.jimsbasementworkshop.com
(CIS Primer for the 911)
(73 911T (RS look) coupe)
(Misc. 911 Parts for Sale)
Last edited by Jim Williams; 09-26-2007 at 07:22 AM..
Reason: correct a mis-type
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