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#1 |
Registered User
Join Date: Mar 2013
Location: Sarasota, Fl
Posts: 2
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Tach operation with cluster swap
So, I am working on this 81 stepside and put in a cluster from a 70 something big truck to get a big tach with a small fuel gauge. I got the cluster pinned out correctly, and everything works as intended.
The tach had a separate harness; Black wire (ground), pink w/ black stripe (ignition + current) and a brown (signal). Hooked it all up, and tach goes past the 5000 mark and doesn't move with engine revs. I read where there was a filter needed, and bought one to go between the brown wire and the distributor. No change. Question: Am I having trouble because the tach originally took a signal from the coil in a points based system and I have HEI? Is there a way to convert the signal? Anyone been here and can help me out? Thanks in advance for your help. |
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#2 | |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Tach operation with cluster swap
Quote:
how high do the revs go? Posted via Mobile Device
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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#3 |
Registered User
Join Date: Mar 2013
Location: Sarasota, Fl
Posts: 2
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Re: Tach operation with cluster swap
V8 396...not the stock motor. I have no idea what the big truck had for an engine.
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#4 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Tach operation with cluster swap
got any pics of it
i understand some 6 cyl diesel tachs have less revs "written" on the front and only go to 4000 not 5000 you mention 5000 so thats sounds right maybe a part number on the board back...
__________________
John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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