Factory tach mod?

[Telecasterjoey]

Hey all! I recently found a cool tach cluster out of a big chevy truck in the scrap yard. I rushed home to try out the tach and I believe its toast! As soon as I start the engine it quickly buries the needle. Has anyone ever successfully rebuilt one themselves? Or has anyone ever taken an autometer gauge and put it behind the stock tach faceplate? I tried searching but came up with nothing...

Thanks!

[Keith Seymore]

Yes - I repaired a factory tach by replacing it with different guts.

The factory tach in my Chevelle quit working in about 1990 or so. I discovered that an IROC Camaro had the same numbering and sweep (7000 rpm through 270 degrees) so I took the IROC guts and bolted them to my Chevelle tach face. I hard wired the the tach (since the printed circuit board was no longer relevant), turned the key to the "on" position and slipped the hand back on the post.

Been that way ever since.

K

[J Knight]

The big truck cluster you got isn't neciserily bad, it uses a different curcit board.
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[motornut]

need to hardwire it
maybe check it loose under the hood
any idea what it's from?
got any pics
no chance it's a six cyl eh(would prob bounce not steady)
not sure if a four would exist but would the signal double up?duno
there is one someone did it with a gas gauge face
and another cool one is a camero tach in there too
heck if you want i could have a look at it.....i did mine with a trailer plug for ez in/out