Another Guage Swap Question-With A Twist

[88ComancheMitch]

Well, I'll make an introduction thread/build thread when I get home (at work now! shhh!), but I have a few quesions.

 

1988 Jeep Comanche Pioneer

98 4.0 H.O. Swap (?)

Auto Trans

 

 

So, here are my questions...

 

Swapped the full gauge cluster with tach/speedo/and all sensory gauges. I know that I need to swap the temp sending unit/oil sending unit to get those gaugest to work. I have an issue though...

 

Everything that I could find online was pertaining to the stock Renix 4.0, and not the H.O. 4.0. I looked at the sensors, and it looks like whoever did the swap kept the old sensors (smaller oil pressure unit, 2 wire temp sensor). The temp sensor is not on the rear of the block like a Renix, it is in the front (not on the block). The oil guage moves, but doesn't really fluctuate, as in it's not working/not accurate. Temps stays dead, where as it did at one time jump all over the place.

 

Question comes to be:

 

Do I still buy the same sending units that are in the write ups for the gauge cluster swap, and run a wire from the temp unit to the old connector for the temp sending unit? Can I use the current 2 wire sending unit and run a wire from it? I'm sure I need to buy the new oil sending unit, but will it fit okay threading wise if I am using the newer block?

 

My last question for this thread pertaints to the speedo on the cluster. It reads accutare, but jumps 1-3mph constantly. I know I've read alot about bad grounds, is this where I should start? Or is it likely that the gears in the cluster are stripped/bad?

[88ComancheMitch]

Well, spliced into the "A" side of the connector. Hoping that the gauge works now. If I grounded out the old single wire (90* elbow looking plug) then the tach would bury. So, it started raining really hard here. I'm hoping that this fixes it. If not I'm at a loss.

[88ComancheMitch]

Ordered a oil pressure sending unit. It should be here Monday I hope.

 

 

As for the temp, it's not working. Does anyone know if the threading on the ~88 and ~98 temp sensors are the same? Can I buy a temp sensor for a 88 and replace the one on my 98 motor?

 

 

Thanks for an help in advance!