Adding a Rev counter to a diesel

Post by **Jetfitzmaurice** » 20 Jan 2015, 16:35

Hi, I've tried searching but not found a definitive answer. I have an 87 doka, originally a 1.7D with no Rev counter, it's now running a 1.9D 1Y and I'd really like to add a Rev counter. Is it as simple as buying a diesel clock set with a Rev counter? Will it work or will I still have to feed it a signal at the engine end? Where does the stock t25 rev counter get its signal from? The alternative is to install an aftermarket one like the auto meter 2888 which has a sensor you strap to the alternator but if at all possible I'd rather keep things stock.
Any help would be greatly appreciated
Best Regards James

Post by **lloydy** » 20 Jan 2015, 18:10

Have a look on the back of the alternator, Does it have a W connection? And does it have a wire attached? (W connection is where it gets the rpm signal from)And do you have two oil pressure switches? One on the front of the head, the other on the oil filter housing. If you do, chances are you can just swap a rev counter pod in.
I don't know much about the 1.7D's, but thats how it is with the 1.6's

Post by **Jetfitzmaurice** » 20 Jan 2015, 20:50

Hi, I've just gone out and had a look, my alternator is a Valeo 70amp VW part number 030 903 023E which has a small plastic plug on with two wires coming off it as well as the main battery cable. As far as I can tell from googling one of these wires is D+ = lamp and the other is W = stator so I guess I'm good to go if I can find a clock set with a Rev counter.

Post by **Funbus** » 21 Jan 2015, 00:01

Any more info on this as I'm a numpty with electrics.
I'm running aaz, has 2 oil pressure sensors and alt with extra wire.
Suppose I got clocks with rev counter how much work is it to wire it all in?
Cheers

Post by **marlinowner** » 21 Jan 2015, 09:48

Disconnect the oil pressure sensors and rev the engine, oil warning buzzer should sound. If it does then a diesel instrument set with rev counter will be a straight swop as required wiring is fitted and functional.

Post by **discipleofsketch** » 21 Jan 2015, 10:27

I can't advise on the alternator wiring, as mine is tdi and driven off the ecu, but I added an aftermarket tacho rather than messing with the other dash stuff:-

Club 80-90 Forums

Adding a Rev counter to a diesel

Adding a Rev counter to a diesel

Re: Adding a Rev counter to a diesel

Re: Adding a Rev counter to a diesel

Re: Adding a Rev counter to a diesel

Re: Adding a Rev counter to a diesel

Re: Adding a Rev counter to a diesel