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I went from a 120 mph to 140 mph speedometer. can some one tell me do I have to change speedometer cable gear? the needle will bounce between 0 to 25 mph and then smooths out.

The gas gauge shows full when yellow wire was grounded. So I am assuming I have to take sending unit back out.

The yellow wire on gas tank sending unit. Does it go all the way to gas gauge? Put new gas tank and sending unit in my C.S. Now gas gauge does not work. Had a hard time getting yellow wire removed. I could have damaged the wire. Tested wire with light tester the light flashed off and on. Does...

Is this the correct part number C80Z-9A626-B for snorkel on 390 S-code CS?

Need help looking for a snorkel and heat shield from exhaust for my S-code 390. I have original heat tube and air cleaner with the emission tube. Need the snorkel No C80z-9A626-B.

Was there a heat riser or spacer between the exhust manifod and H- pipe. On all S code 390 on the passenger side of the 68 GT/CS ?

I am putting the original power steering pump back on my S code 390. Can I use the mercon V transmission fluid if not what should I use ?

Do you use a Exhuast manifold gasket on the S/code 390? If so were can I find one?