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#1 |
How did I get this OLD!
![]() Join Date: Dec 2014
Location: Lamont County, AB, CANADA
Posts: 1,047
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4000RPM tach read on an 8000RPM lens
Making a 4000RPM mechanical tachometer read 8000 RPM with a 50% gear reduction at the distributor. I’m going to re-do the red line to read 5500 RPM
https://67-72chevytrucks.com/vboard/...1&d=1627513183
__________________
1967 Oshawa built LWB Fleetside. 327,3 OTT, 515 Vermilion, CST, PS, PB, Shoulder Harness, Tach,Vac, Speed Warning, Choke Delete, Manual Throttle, Fawn interior. Dealer installed A/C 04/2015, N34 Rosewood Wheel 06/2023 Members who I have met personally. Metaldoc, chevnkevin, 62 Longbed, 72LHorn, 72MARIO, YBNORML, TBONE1964, Classic Bowties, Chevemall, Dagnabbitt. |
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#2 |
Registered User
Join Date: Mar 2010
Location: Oregon
Posts: 189
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Re: 4000RPM tach read on an 8000RPM lens
Hmm,
Kinda cool thinking there. Sounds logical, like it should work. Did all 67-72 tachs operate mechanically? Or would that be from heavy duty truck class such as 1 ton and up? Bob |
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#3 |
How did I get this OLD!
![]() Join Date: Dec 2014
Location: Lamont County, AB, CANADA
Posts: 1,047
|
Re: 4000RPM tach read on an 8000RPM lens
67-72 C50 or C60 Diesel truck
__________________
1967 Oshawa built LWB Fleetside. 327,3 OTT, 515 Vermilion, CST, PS, PB, Shoulder Harness, Tach,Vac, Speed Warning, Choke Delete, Manual Throttle, Fawn interior. Dealer installed A/C 04/2015, N34 Rosewood Wheel 06/2023 Members who I have met personally. Metaldoc, chevnkevin, 62 Longbed, 72LHorn, 72MARIO, YBNORML, TBONE1964, Classic Bowties, Chevemall, Dagnabbitt. |
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#4 |
Registered User
Join Date: Jan 2010
Location: Here
Posts: 5,482
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Re: 4000RPM tach read on an 8000RPM lens
I'm interested to see how it all looks finished in the cluster. Good idea. I never thought of the reduction when I did mine.
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#5 | |
How did I get this OLD!
![]() Join Date: Dec 2014
Location: Lamont County, AB, CANADA
Posts: 1,047
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Re: 4000RPM tach read on an 8000RPM lens
Quote:
4000 to 5000 is above my pay grade to figure out lol. 12.5% reduction I think.
__________________
1967 Oshawa built LWB Fleetside. 327,3 OTT, 515 Vermilion, CST, PS, PB, Shoulder Harness, Tach,Vac, Speed Warning, Choke Delete, Manual Throttle, Fawn interior. Dealer installed A/C 04/2015, N34 Rosewood Wheel 06/2023 Members who I have met personally. Metaldoc, chevnkevin, 62 Longbed, 72LHorn, 72MARIO, YBNORML, TBONE1964, Classic Bowties, Chevemall, Dagnabbitt. |
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#6 | |
Senior Member
![]() Join Date: Apr 2013
Location: Podunk, Texas
Posts: 744
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Re: 4000RPM tach read on an 8000RPM lens
Quote:
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"It is hard to search for a black cat in a dark room, particularly if it is not there. Especially if this cat is smart, brave, and polite." Sergei Shoigu, Russian Minister of Defense |
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#7 | |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
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Re: 4000RPM tach read on an 8000RPM lens
Quote:
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__________________
Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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#8 |
How did I get this OLD!
![]() Join Date: Dec 2014
Location: Lamont County, AB, CANADA
Posts: 1,047
|
Re: 4000RPM tach read on an 8000RPM lens
Thanks for the sweet offer lol. I’m looking forward to getting the mechanical one revved up lol!
__________________
1967 Oshawa built LWB Fleetside. 327,3 OTT, 515 Vermilion, CST, PS, PB, Shoulder Harness, Tach,Vac, Speed Warning, Choke Delete, Manual Throttle, Fawn interior. Dealer installed A/C 04/2015, N34 Rosewood Wheel 06/2023 Members who I have met personally. Metaldoc, chevnkevin, 62 Longbed, 72LHorn, 72MARIO, YBNORML, TBONE1964, Classic Bowties, Chevemall, Dagnabbitt. |
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#9 |
How did I get this OLD!
![]() Join Date: Dec 2014
Location: Lamont County, AB, CANADA
Posts: 1,047
|
Re: 4000RPM tach read on an 8000RPM lens
A mock up of the lens & mechanical tach in the cluster. I have the vacuum gauge in the truck now. I may convert this cluster to accommodate a clock. The finished cluster likely won’t go in the truck till the winter when I install the L79 intake and tach drive distributor. So far I’m happy with how it has turned out.
https://67-72chevytrucks.com/vboard/...1&d=1629514543 https://67-72chevytrucks.com/vboard/...1&d=1629514565 https://67-72chevytrucks.com/vboard/...1&d=1629514585
__________________
1967 Oshawa built LWB Fleetside. 327,3 OTT, 515 Vermilion, CST, PS, PB, Shoulder Harness, Tach,Vac, Speed Warning, Choke Delete, Manual Throttle, Fawn interior. Dealer installed A/C 04/2015, N34 Rosewood Wheel 06/2023 Members who I have met personally. Metaldoc, chevnkevin, 62 Longbed, 72LHorn, 72MARIO, YBNORML, TBONE1964, Classic Bowties, Chevemall, Dagnabbitt. |
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#10 |
How did I get this OLD!
![]() Join Date: Dec 2014
Location: Lamont County, AB, CANADA
Posts: 1,047
|
Re: 4000RPM tach read on an 8000RPM lens
__________________
1967 Oshawa built LWB Fleetside. 327,3 OTT, 515 Vermilion, CST, PS, PB, Shoulder Harness, Tach,Vac, Speed Warning, Choke Delete, Manual Throttle, Fawn interior. Dealer installed A/C 04/2015, N34 Rosewood Wheel 06/2023 Members who I have met personally. Metaldoc, chevnkevin, 62 Longbed, 72LHorn, 72MARIO, YBNORML, TBONE1964, Classic Bowties, Chevemall, Dagnabbitt. |
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#11 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
|
Re: 4000RPM tach read on an 8000RPM lens
It's looking very nice!
__________________
Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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#12 |
Registered User
Join Date: Jan 2010
Location: Here
Posts: 5,482
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Re: 4000RPM tach read on an 8000RPM lens
Looks cool. I like it
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#13 |
How did I get this OLD!
![]() Join Date: Dec 2014
Location: Lamont County, AB, CANADA
Posts: 1,047
|
Re: 4000RPM tach read on an 8000RPM lens
https://67-72chevytrucks.com/vboard/...1&d=1634431784
https://67-72chevytrucks.com/vboard/...1&d=1634431856 https://67-72chevytrucks.com/vboard/...1&d=1634431925 https://67-72chevytrucks.com/vboard/...1&d=1634431974 I installed the L79 intake yesterday and installed the mechanical tach today. Works flawlessly. I’m very happy with the way everything has turned out. I must say I’m just about done with the personalization of this truck. Now just drive and enjoy!! Sorry the last pic is upside down. Maybe someone can correct that.
__________________
1967 Oshawa built LWB Fleetside. 327,3 OTT, 515 Vermilion, CST, PS, PB, Shoulder Harness, Tach,Vac, Speed Warning, Choke Delete, Manual Throttle, Fawn interior. Dealer installed A/C 04/2015, N34 Rosewood Wheel 06/2023 Members who I have met personally. Metaldoc, chevnkevin, 62 Longbed, 72LHorn, 72MARIO, YBNORML, TBONE1964, Classic Bowties, Chevemall, Dagnabbitt. |
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#14 |
Registered User
![]() Join Date: Apr 2012
Location: Lehi,Utah
Posts: 1,330
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Re: 4000RPM tach read on an 8000RPM lens
Flip
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#15 |
How did I get this OLD!
![]() Join Date: Dec 2014
Location: Lamont County, AB, CANADA
Posts: 1,047
|
Re: 4000RPM tach read on an 8000RPM lens
__________________
1967 Oshawa built LWB Fleetside. 327,3 OTT, 515 Vermilion, CST, PS, PB, Shoulder Harness, Tach,Vac, Speed Warning, Choke Delete, Manual Throttle, Fawn interior. Dealer installed A/C 04/2015, N34 Rosewood Wheel 06/2023 Members who I have met personally. Metaldoc, chevnkevin, 62 Longbed, 72LHorn, 72MARIO, YBNORML, TBONE1964, Classic Bowties, Chevemall, Dagnabbitt. |
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#16 |
Registered User
Join Date: Jan 2010
Location: Here
Posts: 5,482
|
Re: 4000RPM tach read on an 8000RPM lens
That is awesome. I can't war to get mine going. A few questions. Can you post a pic of Where you rrouted the cable thru the firewall ad how long was the cable. These are 2 things I need t do till but my cab is at the body shop. Thx.
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#17 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
|
Re: 4000RPM tach read on an 8000RPM lens
Very nice work! It all looks very nice.
__________________
Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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