RPM Meter for Isuzu Ambassador

dmaheshkumar · 28th July 2010, 16:39

Hi,
I plan to fit an RPM meter for my ambassador which is fitted with Imported G1 Isuzu engine.Anybody have done this before,help me in this regards.

CosT,what spares and meter (sensor also) we need to fit this.

SirAlec · 29th July 2010, 23:34

You can any one made by aftermarket guage specialist. Market is flooded with them. Chinese are also available.

Everything you need come in the package along with instruction manual.

Many members are also selling them. Check the classified section.

adrian · 5th August 2010, 13:41

Quote:

Originally Posted by SirAlec

You can any one made by aftermarket guage specialist. Market is flooded with them. Chinese are also available.

Everything you need come in the package along with instruction manual.

Many members are also selling them. Check the classified section.

I am wondering why Hindusthan Motors is not making the RPM meter as a standard gauge?

kavesh55 · 5th August 2010, 13:45

Hindustan Motors is making the Amabassador, isnt that enough.

adrian · 5th August 2010, 13:52

Quote:

Originally Posted by kavesh55

Hindustan Motors is making the Amabassador, isnt that enough.

Yes we really have to thank them for that.

ramzsys · 5th August 2010, 18:16

Where are you planning to get it done?

ilangop · 5th August 2010, 20:58

Mahesh,
Does your alternator have a WL out? Is the engine equipped with a turbo?
Even if your alternator doesnt have a WL out, any competent electrician can get such a terminal soldered. You will also have to know the pulley ratio.

SirAlec · 5th August 2010, 20:58

Quote:

Originally Posted by adrian

I am wondering why Hindusthan Motors is not making the RPM meter as a standard gauge?

I don't know what to say. They were not able to change the Morris design that is 60 years old. Doesn't that say anything about the company and the morons that run it.

adrian · 6th August 2010, 13:31

Quote:

Originally Posted by SirAlec

I don't know what to say. They were not able to change the Morris design that is 60 years old. Doesn't that say anything about the company and the morons that run it.

The Morris design is what makes the Ambassador unique. The HM could have easily upgraded the gadgets at the least !

My father owns a 1989 Ambassador and I too love to see an RPM meter on the dash. If my father Permits !!!

adrian · 6th August 2010, 14:05

Quote:

Originally Posted by ilangop

Mahesh,
Does your alternator have a WL out? Is the engine equipped with a turbo?
Even if your alternator doesnt have a WL out, any competent electrician can get such a terminal soldered. You will also have to know the pulley ratio.

I saw the rpm meter on the 118 in your garage. Could you please describe the procedure for installing an RPM meter?

ilangop · 6th August 2010, 15:49

Adrian,
118NE is a petrol vehicle and the spark signal itself is indicative of the speed at which engine runs. In the Diesel engine we are talking about, there is no such a signal that correlates the speed of crankshaft (CS) to the electrical world. So we depend on the AC generated at the alternator. The frequency of this AC is scaled to engine rpm. Thats the reason why the alternator needs the WL terminal and we need to know the pulley ratios. For example, if the alternator generates 12pulses per revolution and the pulley ratio being 2.2; 12/2.2 = 5.45 pulses would correspond to 1 revolution of CS. Once we know this relation, the rest is straight forward.

adrian · 6th August 2010, 16:28

Quote:

Originally Posted by ilangop

Adrian,
118NE is a petrol vehicle and the spark signal itself is indicative of the speed at which engine runs. In the Diesel engine we are talking about, there is no such a signal that correlates the speed of crankshaft (CS) to the electrical world. So we depend on the AC generated at the alternator. The frequency of this AC is scaled to engine rpm. Thats the reason why the alternator needs the WL terminal and we need to know the pulley ratios. For example, if the alternator generates 12pulses per revolution and the pulley ratio being 2.2; 12/2.2 = 5.45 pulses would correspond to 1 revolution of CS. Once we know this relation, the rest is straight forward.

Thanks ilangop, that was really informative.

dmaheshkumar · 9th August 2010, 14:39

What is the meter i need to buy and what sensor will be matched for Isuzu G1 Engines.

ilangop · 10th August 2010, 13:28

Mahesh,
You dont need to install any sensor, just take the alternator to an electrician and ask him to solder and take out a speed out (W) terminal. This serves the input to your tacho. Please go through the previous post of mine on how the tacho receives speed signal.

sidvar · 3rd July 2023, 12:32

Did you eventually instal a tachometer? I am thinking of doing the same.

Quote:

Originally Posted by dmaheshkumar

Hi,
I plan to fit an RPM meter for my ambassador which is fitted with Imported G1 Isuzu engine.Anybody have done this before,help me in this regards.

CosT,what spares and meter (sensor also) we need to fit this.

28th July 2010, 16:39	#1
dmaheshkumar BHPian Join Date: Aug 2008 Location: Coimbatore Posts: 217 Thanked: 143 Times	RPM Meter for Isuzu Ambassador Hi, I plan to fit an RPM meter for my ambassador which is fitted with Imported G1 Isuzu engine.Anybody have done this before,help me in this regards. CosT,what spares and meter (sensor also) we need to fit this.
	() Thanks

29th July 2010, 23:34	#2
SirAlec Senior - BHPian Join Date: Sep 2006 Location: zxc Posts: 3,393 Thanked: 726 Times	You can any one made by aftermarket guage specialist. Market is flooded with them. Chinese are also available. Everything you need come in the package along with instruction manual. Many members are also selling them. Check the classified section.
	() Thanks

5th August 2010, 13:45	#4
kavesh55 BHPian Join Date: Nov 2007 Location: Mumbai Posts: 748 Thanked: 49 Times	Hindustan Motors is making the Amabassador, isnt that enough.
	() Thanks

5th August 2010, 18:16	#6
ramzsys Senior - BHPian Join Date: Dec 2006 Location: NH209 Posts: 1,775 Thanked: 1,462 Times	Where are you planning to get it done?
	() Thanks

5th August 2010, 20:58	#7
ilangop BHPian Join Date: Jul 2008 Location: Chennai Posts: 992 Thanked: 903 Times View My Garage	Mahesh, Does your alternator have a WL out? Is the engine equipped with a turbo? Even if your alternator doesnt have a WL out, any competent electrician can get such a terminal soldered. You will also have to know the pulley ratio.
	() Thanks

6th August 2010, 15:49	#11
ilangop BHPian Join Date: Jul 2008 Location: Chennai Posts: 992 Thanked: 903 Times View My Garage	Adrian, 118NE is a petrol vehicle and the spark signal itself is indicative of the speed at which engine runs. In the Diesel engine we are talking about, there is no such a signal that correlates the speed of crankshaft (CS) to the electrical world. So we depend on the AC generated at the alternator. The frequency of this AC is scaled to engine rpm. Thats the reason why the alternator needs the WL terminal and we need to know the pulley ratios. For example, if the alternator generates 12pulses per revolution and the pulley ratio being 2.2; 12/2.2 = 5.45 pulses would correspond to 1 revolution of CS. Once we know this relation, the rest is straight forward.
	() Thanks

9th August 2010, 14:39	#13
dmaheshkumar BHPian Join Date: Aug 2008 Location: Coimbatore Posts: 217 Thanked: 143 Times	What is the meter i need to buy and what sensor will be matched for Isuzu G1 Engines.
	() Thanks

10th August 2010, 13:28	#14
ilangop BHPian Join Date: Jul 2008 Location: Chennai Posts: 992 Thanked: 903 Times View My Garage	Mahesh, You dont need to install any sensor, just take the alternator to an electrician and ask him to solder and take out a speed out (W) terminal. This serves the input to your tacho. Please go through the previous post of mine on how the tacho receives speed signal. Attached Thumbnails Last edited by ilangop : 10th August 2010 at 13:31. Reason: Added picture
	(3) Thanks