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QRP
Samba Member
Joined: April 27, 2008
Posts: 1899
Location: NORTH HOLLYWOOD,CA
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 Posted: Thu Jun 02, 2022 9:30 am Post subject: Tac hook up ? |
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A quick question here.
This tac came in a bug I just got but I'm not sure about the wiring, I don't see any pos or neg markings on it.
I am assuming the flat prong is pos and the round post goes to the coil.
Thanks in advance. |
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RCP Phx
Samba Member
Joined: November 20, 2021
Posts: 496
Location: Phoenix,AZ
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| Posted: Thu Jun 02, 2022 9:49 am Post subject: Re: Tac hook up ? |
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| I wouldn't assume anything. Why not just call them and ask them? |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4510
Location: viroqua wi.
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| Posted: Thu Jun 02, 2022 1:38 pm Post subject: Re: Tac hook up ? |
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| That would be my guess. I would put a 9v battery - side on case + side on flat tap and see if it lights. If it does that would be your connection to 58b on your light switch or piggy back from dash lights. |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4510
Location: viroqua wi.
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| Posted: Thu Jun 02, 2022 2:45 pm Post subject: Re: Tac hook up ? |
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| I might be wrong, Is there a separate lamp holder? |
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QRP
Samba Member
Joined: April 27, 2008
Posts: 1899
Location: NORTH HOLLYWOOD,CA
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| Posted: Thu Jun 02, 2022 4:48 pm Post subject: Re: Tac hook up ? |
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| bsairhead wrote: |
| I might be wrong, Is there a separate lamp holder? |
Yes there is. |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4510
Location: viroqua wi.
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| Posted: Thu Jun 02, 2022 4:55 pm Post subject: Re: Tac hook up ? |
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| My MG buddy says keyed hot on tab coil negative on lug and dash lights on insulated lamp holder and there should be a housing ground or the mounting stud. |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 79715
Location: Sneaking up behind you
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| Posted: Thu Jun 02, 2022 5:08 pm Post subject: Re: Tac hook up ? |
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| bsairhead wrote: |
| My MG buddy |
Positive Earth?
_________________
Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
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עַם יִשְׂרָאֵל חַי |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4510
Location: viroqua wi.
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| Posted: Thu Jun 02, 2022 5:21 pm Post subject: Re: Tac hook up ? |
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| Glenn wrote: |
| bsairhead wrote: |
| My MG buddy |
Positive Earth? |
Nope not all are positive earth. The posters picture even says negative earth. |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4510
Location: viroqua wi.
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| Posted: Thu Jun 02, 2022 5:26 pm Post subject: Re: Tac hook up ? |
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| 67 on are negative earth |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20834
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Fri Jun 03, 2022 7:31 am Post subject: Re: Tac hook up ? |
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Found on i-net search...
http://www.mgb-stuff.org.uk/tach.htm
_________________
“Fear The Government That Wants To Take Your Guns"
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All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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RCP Phx
Samba Member
Joined: November 20, 2021
Posts: 496
Location: Phoenix,AZ
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| Posted: Fri Jun 03, 2022 9:49 am Post subject: Re: Tac hook up ? |
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I think right now you need to decide on it's worth! You don't even know if it works and it's age is very questionable? Where did you intend to mount it? There are 100's of new ones out there that are cheap and have many more options/features!
https://www.summitracing.com/parts/bgs-fst-7906 |
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bsairhead
Samba Member
Joined: October 08, 2008
Posts: 4510
Location: viroqua wi.
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| Posted: Fri Jun 03, 2022 10:13 am Post subject: Re: Tac hook up ? |
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| RCP Phx wrote: |
I think right now you need to decide on it's worth! You don't even know if it works and it's age is very questionable? Where did you intend to mount it? There are 100's of new ones out there that are cheap and have many more options/features!
https://www.summitracing.com/parts/bgs-fst-7906 |
Smith's makes very good gauges and no new one is as cool. |
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67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 11225
Location: Oregon
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| Posted: Fri Jun 03, 2022 11:32 am Post subject: Re: Tac hook up ? |
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| bsairhead wrote: |
| RCP Phx wrote: |
I think right now you need to decide on it's worth! You don't even know if it works and it's age is very questionable? Where did you intend to mount it? There are 100's of new ones out there that are cheap and have many more options/features!
https://www.summitracing.com/parts/bgs-fst-7906 |
Smith's makes very good gauges and no new one is as cool. |
The tach is already mounted in the OP's dash. I saw pic of it in the HBB offroad forum.
_________________
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Cheap parts are gonna disappoint you.
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There's never enough time to do it right the first time. But there's always enough time to do it thrice.
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QRP
Samba Member
Joined: April 27, 2008
Posts: 1899
Location: NORTH HOLLYWOOD,CA
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| Posted: Fri Jun 03, 2022 3:31 pm Post subject: Re: Tac hook up ? |
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The tac was mounted in the dash when I got the car but I removed everything the previous ( tweaker ) owner had done, I didn't trust any of it.
Anyway I just don't wanna mess this tac up by wiring it up wrong.
And it will be tested before or if it goes back in. |
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Wolfgangdieter
Samba Member
Joined: June 25, 2008
Posts: 1998
Location: FL Panhandle
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| Posted: Sat Jun 04, 2022 7:58 am Post subject: Re: Tac hook up ? |
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Worth mounting just for the NEGATIVE EARTH logo!
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