I was given a Sun Super Tach. II. Previous owner said it did not work on his fuel injected 305 ChevyV-8.Is it possible this tach. would function on a six cyl., but not on a v-8? Also, could I use the nice factory tach. out of my 1992 Caravan(with the crappy Bendix Antilock brakes.) As I've posted before, my vehicle is a 1979 stock 225 1bbl.2wd, D-100 pickup. (This year truck could have been ordered with a factory tach. as it came standard on the Warlock and Lil Red Express.) All opinions on gauges for slants, but especially tachometers are appreciated. THANKS.

Your Sun Super Tach II will work fine on your slant six. There is a switch in the back for 8,6,4 cyl operation. I am not sure why it wouldn't work on your friends V8. As long as your have a distributor it will work.
Hear is a link to the manual http://www.sunpro.com/publish/2007/09/2 ... _16472.pdf

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1966 Signet
Turbo Slant Six

I looked at the switch on the back and it was set on 4 cylinders,so I set it on 6. No wonder it didn't work on his V-8! The motto is; Don't forget to "switch" your switch !!

I've always liked "When all else fails, follow the directions!"