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#1
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In-Dash Tach Upgrade. And Rally Clock Question
So I bought a 68 Rally Clock from a PY member. Installed it and realized i didnt test it. well i stripped a plastic gear while adjusting the time, and during the repair decided to change plans & RE-rebuild my Original 68 Tach.
So, Advanced Auto sells a BOSCH Tach that goes 0-8000 in 270* range like Stock. So i tore it down, and used it as guts on the 68 Faceplate. Takes two new drill-holes in the back cover to mount the Modern tach guts to the old sheetmetal cover. Front 68' Plate can match-drill into the Modern Tach plastic bar using #2 drill, tap and original screws. (done this a decade before but THAT prior modern movementt locked-up because of CHINA..) So, 68 Tach is all together nicely, and ready to go in the Dash. After the install goes well ( and it should) , then I would like to put a modern movement into the 68' Rally Clock for a future install. What clock movement fits? |
#2
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Don't know the answer on the clock movement but that's a great idea with the tach. Do you have any pictures? My tach hasn't worked in years possibly because of my HEI ignition.
Sent from my moto g stylus (2021) using Tapatalk
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Greg Reid Palmetto, Georgia |
#3
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It appears you can buy a quartz clock replacement: https://www.ebay.com/itm/153511803749 The ad says it's 100% USA made.
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#4
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For a transistor (HEI) ignition you need a transistor tach, passive (single wire) won't work. Starting for the '72 model year, Pontiac tachs were transistor. Back in the day I converted hood tachs with the round ceramic circuit board to transistor by using a Vega circuit board and changing the trim capacitor to a 33 ufd (.033 mfd) for a V8 (47 for a 6 cyl, 68 for a 4)
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The Following User Says Thank You to padgett For This Useful Post: | ||
#5
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as stated in the ad
"While the clock face looks identical to the original, " yah ok ,,,, its kinda close for 69-72 but 68 nawt even close .... maybe use your facia?? but I still like the click sound on rewinding ,,,, I would have offered you a clock but my 68's all have rally gauge mates ... S T |
#6
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Scott, Nice Rally Gauge Stash!
Padget, The Bosch from Advanced Auto requires the +12V line. Seems to be accurate. Greg, Photos would appear like Factory stock look. Nuthin to see. I might post a photo later. Stuart, Thanks for the ebay link. my Clock works, but i stripped a red plastic gear tooth for setting time. me thinks a Quartx movement might or might not solve that problem. Pro-trick tip: The new tachs can tend to Compass-up when off if the car is pointed such way. When powered the Tach goes CCW to ZERO, but if compassed-up at 5800 rpm or more then it will go to 8000 rpm when poweredup and be stoopid for that drive. So, i epoxied a toothpick section to the Rally Tach Centerbutton at 6000 for positive stop, and power-up will go to zero. My SD-rodded engine doesnt need to go past 5500 rpm. |
#7
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Another thought is to check through the gears at https://www.odometergears.com He makes all kinds of gears to fix odometers and speedometers, and is well known for his service and quality. I don't know if he has anything for clocks, but maybe there's something in his inventory that can be made to fit.
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#8
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Stuart, Thanks, you motivated my search and found OPG for GM clock stuff...
https://www.opgi.com/gauges-accessor...t-s003015.html
__________________
12.24/111.6MPH/1.76 60'/28"/3.54:1/SP-TH400/469 R96A/236-244-112LC/1050&TorkerI//3850Lbs//15MPG/89oct Sold 2003: 12.00/112MPH/1.61 60'/26"x3.31:1/10"/469 #48/245-255-110LSA/Q-Jet-Torker/3650Lbs//18MPG 94oct Sold 1994: 11.00/123MPH/1.50 60'/29.5"x4.10:1/10"/469 #48/245-255-110LSA/Dual600s-Wenzler/3250Lbs//94oct |
#9
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I got my clock quartz conversion from Instrument Specialties years ago. https://www.clocksandgauges.com/quartz-conversion.html
__________________
Ken '68 GTO - Ram Air II 464 - 236/242 roller - 9.5” TSP converter - 3.55 posi (build thread | walk around) '95 Comp T/A #6 M6 - bone stock (pics) |
#10
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Quote:
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#11
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Um errr ahh well, could be.
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#12
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Quote:
Sent from my moto g stylus (2021) using Tapatalk
__________________
Greg Reid Palmetto, Georgia |
#13
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And of course I've been to your page on Zenith's TO radios. I picked up an H500 several years ago at a flea market. It didn't work BUT everything was there, manuals, accessories, etc. Case in very good shape too and at a very good price! Took it home, found the radio had been rewired to accept another audio output tube. Using the schematic and a correct tube, rewired it, bought a 1L6 tube, Zowie, converted the selenium rectifier to a diode set up and checking to make sure all filament voltages were within decent tolerances, it works great!!! Thank you again for your knowledge Mr. hood tach man!!!
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#14
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RA IV jack; TransOcianic huh. 1L6 sounds hard to find. Diode swap in was a good move.
Greg, The only Tiny Bosch Tach Advanced Auto sells on-shelf : 0-8000 rpm and 270 degree swing like Stock. Voodoo68; Thanks, I may call clocksANDgauges to see about the tiny gear(s) needed. Heck, maybe get their QTZ movement. |
The Following User Says Thank You to Half-Inch Stud For This Useful Post: | ||
#15
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HIS,
Did you use the factory tach faceplate with your setup? A pic of the installed tach would be great. Thanks! |
#16
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Pete Serio restored my non-operational tach and made it HEI compatible. He did a great job on the rest of the instrumentation as well.
__________________
-Jeremy 1968 GTO 4-spd convertible, console, factory gauges, hidden headlights, 3.90:1 posi, AM/FM radio. 1962 Catalina convertible, Starlight black w maroon interior & white top. |
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