Tach

[Redneckchevy]

Has any one ever taken out the Brake light and install a gas gauge and then ware the gas gage was install a tach? if so what problems did u run into and if any pics could you post some?  I dont no why chevy would make a gas gauge that big in the first place...

[VileZambonie]

That was actually an option for these trucks

http://cgi.ebay.com/ebaymotors/73-87-TACH-VAC-gauges-DIESEL-Chevy-gmc-truck-GM-tack_W0QQitemZ130191918780QQcmdZViewItem?hash=item130191918780

[Redneckchevy]

Thanks vile

[Captkaos]

DON'T Get that one though, it only goes to 4000 as it is a diesel tach....

[Redneckchevy]

Thanks i didnt see that...When i find the right one about how many rmps will it say?

[VileZambonie]

http://cgi.ebay.com/ebaymotors/1976-Chevy-Truck-Gauges-w-Tach-Vacuum-73-87_W0QQitemZ280192622109QQcmdZViewItem?hash=item280192622109#ebayphotohosting

http://cgi.ebay.com/ebaymotors/73-87-81-87-Chevy-Truck-Instrument-Cluster-with-Tach_W0QQitemZ180208029680QQcmdZViewItem?hash=item180208029680

http://cgi.ebay.com/ebaymotors/73-87-Chevrolet-Truck-Automatic-Tach-Dash_W0QQitemZ190191842979QQcmdZViewItem?hash=item190191842979

[Captkaos]

Also be aware that there are several versions of these clusters.  You can't just randomly chose one with a tach and plug and play it into your truck.

If you have an 86 as listed in your sig, you need a 1978-up tach to work. (82-87 pickup tachs are RARE and usually only found in larger trucks, but listed as 1/2T's)
In addition, 99% of people on Ebay don't have a clue about the swapability and list them as 73-87, which isn't true.  If they are listed as "as-is" or "untested" read that as it doesn't work.  They can be broken down as 73-75, 76-77 and 78-81(91).

Crossy who has built, bought and sold more than I ever had wrote an article on this which is listed here...
http://www.73-87.com/7387garage/interior/factory%20tachometers.htm

[Redneckchevy]

Well then i didn't no even a 1/4 of that..U probably saved me a cpl houndred bucks! I think ill have to go with a aftermarket then....I might get lucky and find one...it has a V6 for now but ill be swapping for the V8 soon...But i think its going to be hard to find one that even works

[Captkaos]

You can find them that work, I just wanted to warn you.  When I sold them, I would hook the tach up and video it working on a running motor, so you could see it was working.  It is a simple hook-up to test them so there is no reason why they shouldn't be tested except 90% know they don't work...  it takes 5 minutes to test them...

If they are asking high dollar for them, EVERY gauge should work, not just the tach.  I sold mine for 150-200, but all the gauges worked, not just the tach.

[Redneckchevy]

150-200 is a great deal...Gives the truck a better look then just having a giant auto meter sitting on the dash ..just beggin for some one to steal it...And i agree with ya...But most pepole dont no nothing all they no is they want the money lol

[Redneckchevy]

ok...Got me a tach...On a hei what wire to a piggy back on? its a sunpro tach...The a green wire for the hei....v6 engine...86 k10

[VileZambonie]

Your tach lead is always the negative side of the coil. On a GM HEI your coil cover should be labeled Bat and Tach

[Redneckchevy]

Thank you for the fat help vile! always appreciated