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Matt

Dash Acting like a tacho

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I have an XE was original six cylinder car but I transferred a 351 into it and now the Speedo is acting like a tacho just don’t know how to fix it do I need the speed sensor from the six cylinder gearbox Or do I have some wires crossed

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possibly didn't connect or have a bad earth connection

 

the wiring is same for V8 and 6cyl other than a couple(air con wire slightly longer, choke wire from alternator on 6cyl) 

 

 

 

 

 

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6 hours ago, deankdx said:

T5 and single rail same as 6cyl BW40.

 

C4 auto or FMX use a different gear

Correct, But whether any of those boxes are behind a 6, or a 8 makes no difference to the gear in the box, or the gear on the transducer.

eg: a single rail out of a V8 will bolt in, and plug up in a 6 cyl car and read correctly as long as the transducer gear is right for the diff ratio.

as did the 6 cyl T5 I put behind my missus’s 351, but had to use the XE transducer, which was a 6 cyl one.

 

OP didn’t say which box he is running now, but if it has a later than XE transducer that would make the speedo play up as XE and later have a different plus rate.

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