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Parts Wanted / Re: EFE or Heat riser valve/spacer
« Last post by DD78TA on March 28, 2015, 07:20:39 AM »
Electrical / Re: Tach not moving at all
« Last post by Aus78Formula on March 28, 2015, 12:54:21 AM »
The internal circuit board is a common fault. These can be replaced but sourcing an original is hard. I picked up an NOS circuit board in box and mailed overseas, and it didn't fix the problem. You can also get externally wired circuit boards, instrument repair places do it all the time but may have to modify your wiring to suit. You can also sourced a good used unit to swap over, or to swap the circuit board out of, simply plugs onto terminals inside face.

Yes, to access any of that you'll need to remove the dash facia, drop the steering column a little, unplug all gauges and speedo cable to be able to remove entire main gauge cluster, of which the tacho is only part of. There's only two wires, try them direct perhaps in case that is where the fault lies. You can also check that the tacho is actually plugged into the HEI dizzy side, 2 plugs, one from Battery and one for Tacho, both listed and can't be mixed up.

Also, check the 25A fuse shared by the Heater/Air Con, think it's the one. You'll see a pink wire with clear plastic plugs jumpered onto it, of course if it's not there you'll find another reason.
Parts Wanted / Re: EFE or Heat riser valve/spacer
« Last post by drtracer58 on March 27, 2015, 07:40:06 PM »
Auto or 4-Speed ??   I think they are different .. Due to the Z-Bar / Clutch Linkage
Parts Wanted / EFE or Heat riser valve/spacer
« Last post by DD78TA on March 27, 2015, 06:52:12 PM »
I would like a solid EFE valve if someone has a spare. Not planning on using the flap, I'll remove that, I just need it to hook up my exhaust pipe correctly. I can clean it up, no worries about dirt. Thanks, Don
Electrical / Tach not moving at all
« Last post by jvmagic on March 27, 2015, 04:22:12 PM »

I took the bezel off and trying to figure out how to troubleshoot the tach that does not work.  It sits on 0 all the time.  The clock works perfect.  :-?

Do I need to pull the unit out to troubleshoot?  How do I go about this?  Do I have to disconnect the speedometer cables etc..  Hope it's not a lot of work? 
Is there a sole fuse for the tach?  If so, where are the fuses located?

Thanks in advance.
Cars for Sale/Wanted / Re: 1977 Trans Am 1 Owner National Show Winner
« Last post by Blue78TA on March 27, 2015, 01:27:15 PM »
 :o WOW
Parts Wanted / Re: engine mount brackets 77 t/a
« Last post by Mac6539 on March 27, 2015, 01:25:01 PM »
thi did you get a chance to look at them?
Trans Am Values / Re: 79 10th Do you think this is a good deal or not?
« Last post by Blue78TA on March 27, 2015, 01:19:48 PM »
I know that these cars are valuable, but I'm like you without the original motor that kills the value. Thanks for your comments. ;)

It does say obo.....
DriveTrain / engine brackets
« Last post by Mac6539 on March 27, 2015, 12:10:21 PM »
does anyone know if these brackets will fit a 77 t/a with a 455 pony 496858 and 496859
DriveTrain / Re: Head Work/ Head Porting
« Last post by 1969firebird on March 27, 2015, 10:16:17 AM »
Thanks 72blackbird.

If I needed to slightly open up the chambers to be in the safe zone with pump gas, which areas would be most effective to grind at? Can I improve the chamber design and flame propagation while gaining some extra cc's?

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