First I would like to apologize if this is deemed to have been posted in the wrong section or answered before.

I've tryed searching but haven't come up with an answer.

Hypothetically speaking, if I were to swap in a non-computer controlled diesel engine, no matter what engine, into a 1991 2WD, non air conditioned S10 will the stock gauges work after the swap using the stock S10 sending units?

This would include the oil pressure, temperature, fuel, volts, and speedometer.

BTW, the stock 700R4 and stock alternator would be used.

Also, I'm only concerned about gauge function, not torque converter lockup or anything else. ONLY the gauges.

Thanks, Russ

 

are u talking bout a cummins swap?

the stock 700r4 wont even come close to holding the power.

u would have to make a bracket for the alt to work.

as long as u reused all your sensors it should work.

if using the 12v cummins, ur gonna have to beef up the front end

 

NOTICE; I'M NOT TRYING TO COME ACROSS AS A TOTAL JACKASS WITH THE FOLLOWING POST. JUST TRYING TO GET SOME INFORMATION AND TO HOPEFULLY CLARIFY MY ORIGINAL POST.

No, not a Cummins swap. For all I know it may be a Perkins 4.108, Detroit 6-71 or a transaxle/engine combo from a VW rabbit.

It doesn't matter what engine. I'm simply asking about swapping a non-computer controlled diesel into a 1991 Chevrolet S10 and retaining the stock sending units from the 4.3 so the gauges will all function.

It other words, will all of the gauges work by retaining the stock sending units?

VSS/Speedometer
Oil pressure
Engine coolant temp.
Volts

Or do these all rely completely on the ECM to work?

So if I were to transplant Brand X engine, re-use all of the stock senders, plug the truck wiring back onto the stock senders, will the stock gauges work correctly?

I don't care if the CEL is on. I don't care if the "check gauges" light is on.

Just trying to figure out if the gauge functions are completely dependent on the ECM or if the gauges are along the lines of a seperate part/program and will still function if the stock sending units are installed in Brand X engine.

Sorry for being rather repetitve and wordy.

Thanks, Russ

 

Russ, if you use all of the original factory sending units, then everything should work... Not 100% sure on the alternator tho... Many later models run the voltage regulator from the ecm... Throttle position sensor and fuel injectors won't be used, so you'll definetely have a CEL....

 

I could live without the volt gauge. As for the CEL, that's not an issue either.

So the gauges are NOT dependent on the ECM?

Oh, nice COE BTW.

 

Russ, the only gauge that might be a problem is the speedo... A 91 should have an electric signal generator instead of a cable... What I was referring to ion the alternator is that many manufacturers now put the voltage regulator in the ecm... Not sure if yours is that way.. If it is in the ecm, you can wire in an external regulator to bypass things.. I don't have a diagram of later trucks here at the high school, so I'm going off of an extremely flaky memory...


Ps. the COE is in several pieces, patiently awating for several other projects and honey do's to be completed first..

 

Yes, the '91 has the electric speedometer.

The alternator isn't a big deal. I can do something with that.

If I decide to pursue a diesel swap, I just don't want to get it done mechanically (mounts, lines, etc.) only to find out that I need to swap to all new aftermarket gauges or to an older dash assembly with mechanical speedo.

Honey do lists, for some reason they seem to be a self perpetuating.....

 

91' should be far enough back that your senders should work. I know that the throttle body worked off the ecm, and probably the transmission valve body, but you shouldn't have any big issues w/guages working.

 

Thanks Hobby. The trans has the TV cable so that shouldn't be a problem.

 

if you get a good elec schematic you should be able to trace the wires in and if they go to the ecm they probably are using it for more of a connection than a conversion for those lights you will want you will want to check all wiring going to gauges you could tap into them and bypass ecm the alt you could use a older internal reg alt many engines used gm alt any way they are easy to adapt and wire in it just senses volts for the gauge the spedo should actually come from the bcm and remove check engine light it will come on for sure