Technical Tach ID needed

Anyone know what it is? Looking for a wiring diagram. Only thing it says on it is made in the USA

 

show us the wires, so we can make a poorly educated guess.

it doesn't match the pictures in any of my Sears, Wards, or JC Wx catalogs.

 

Numbers on that bracket tell anything?

 

Sun SST-90

 

here is an exceptionally crappy picture of the wires. There is Red, green, black, blue and yellow.

 

Maybe a knock off? Don’t the sun ones have sun on the face?

 

I think your correct, the red warning needle is not like that of a Sun unit.

 

comparison with the Sun that this off-brand is a copy of

 

I think it might be a RAC Greenline 270 deg. Part #355013

 

I agree with tomcat11. I think it is a RAC. I bought one at K-Mart in the 70's. It is hanging on the shop wall. I will look for the instructions on Thursday when I am home.

 

I do believe we have a correct ID! Now if we get a wiring diagram I would be ecstatic!

 

There was a thread a long time ago asking that same question. You can view it here: Wiring a RAC GT Tach | The H.A.M.B.

 

Got curious and Googled it. This might give you some clues:

https://corvaircenter.com/forum/viewtopic.php?t=682722

Russ

 

Thank you!

 

Red ... 12v +
Black ... Ground
Green ... Neg Coil [signal]
Yellow ... Internal Coil Magneto tachometer signal
Blue ... Often used for recording in playback tachometers [sometimes lights]

Just hook up Red, Black, Green and try it [the worst that could happen is a "death ray" from the sky]
These 3 colours are universal aftermarket colours for all rev counting devices [shift lights, tachs etc]

 

57 Fargo
Here is a picture of my RAC tach, it hangs on the wall in my shop. That tach has been past 6,000 rpm on the infamous Woodward Ave, Telegraph Road, Haggerty Road & Milan Dragway and many stop lights. (only 6,000 rpm because it was in a GTO and 6,000 was about it for a 389)
Attached are the instructions that came with the tach. If you can't read this, send me a pm with your address and I will mail you a readable photo copy. Greg

 

Thanks!

 

Kind of reminds me of this particular floor mounted tach in my friends Buick Wildcat, but I know that its not the same one as posted by the OP.

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