Speedo

[Guest s11pyk]

in another thread this problem has been mentioned by myself and now reported by another, so.....

 

i changed my clocks and now my rev counter only goes up to 3k, my car is an efi. the clocks i put in have the fuel and temp the same way round, whats goin on.

 

someone mentioned the edis or something?? running new wires etc. this is not my strong point but i really dont want to be paying an auto electrician.

help please

[Guest s6boy1979]

I've got the same problem!!!

[Guest s11pyk]

we will find the cure, somehow

[Guest s6boy1979]

The speedo worked ok until i swapped the clocks

[Guest s11pyk]

The speedo worked ok until i swapped the clocks

mine too. its not gonna be the hardest thing in the world to sort!

[iansoutham]

The fuel gauge and temp gauges are a year definition, not a model or engine specification.

 

Pre 1988 had the fuel on the right, post 1988 had the fuel on the left.

 

The reason that your rev counter is only reading half rpm is because it is only seeing half rpm. You need the rev counter from a non-EFI car, or you need to rewire the green wire on the dash clocks plug to a different pickup source within the EDIS module. I would swap the rev counter over personally.

 

EFI (CVH and HCS-engined) cars have a specific rev counter. Same as if you put EFI clocks into a non-EFI car, as soon as you put your foot down and rev the car, the needle will flip straight past the redline and end up the wrong side of the needle-stop as it will be seeing twice the actual rpm.

[RobMk4TwinCarb]

Is there a way to determine which clocks are which on the clocks as I have some old one's laying about was going to sell and don't want to sell to the wrong type if you get my meaning.

[iansoutham]

The most accurate way is to take the clocks apart and get the part number from the rev counter itself and post it here. I can tell you from that. The number will be something like 88AB 17360 AA.

 

I think some models had a different number underneath the needle spindle, but it is late and I can't remember for sure.

[RobMk4TwinCarb]

I take it the first 2 numbers are the year ? Anyway thanks ill have a look tomorrow maybe and get back to you.

[Guest s6boy1979]

The fuel gauge and temp gauges are a year definition, not a model or engine specification.

 

Pre 1988 had the fuel on the right, post 1988 had the fuel on the left.

 

The reason that your rev counter is only reading half rpm is because it is only seeing half rpm. You need the rev counter from a non-EFI car, or you need to rewire the green wire on the dash clocks plug to a different pickup source within the EDIS module. I would swap the rev counter over personally.

 

EFI (CVH and HCS-engined) cars have a specific rev counter. Same as if you put EFI clocks into a non-EFI car, as soon as you put your foot down and rev the car, the needle will flip straight past the redline and end up the wrong side of the needle-stop as it will be seeing twice the actual rpm.

 

 

Mine is a 1990 efi and the clocks i took out had the fuel on the left and the clocks i put in have the fuel on the same side and are from a late efi as well, that all works fine. The rev counter that is playing up now doesn't even read half revs it goes to 1500 max. Is this just a knackered rev counter

[iansoutham]

Mine is a 1990 efi and the clocks i took out had the fuel on the left and the clocks i put in have the fuel on the same side and are from a late efi as well, that all works fine. The rev counter that is playing up now doesn't even read half revs it goes to 1500 max. Is this just a knackered rev counter

 

Yep, most likely the spring has gone weak.

[Guest s6boy1979]

Great!!!

 

Cheers dude

[Guest s11pyk]

weak spring? can i strip the old unit and fix my replacement then? the clocks are clean themselves and i dont like white dials and all that i just want tidy working dials!