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post #1 of (permalink) Old 09-11-2006, 09:30 AM Thread Starter
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Sunpro Gauge

I bought a sunpro mechanical water temp guage to put in my 4.2L but the coupler is too large to screw into spot where the coolant temp sending unit was.
Can I drill and tap this hole or will I break the water jacket?
Does anybody make aftermarket mechanical guages for the 4.2L?
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post #2 of (permalink) Old 09-11-2006, 09:43 AM
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Re: Sunpro Gauge

I would NOT attempt to change the size of the hole for the existing sending unit. I assume you are talking about the one that is located at the rear of the head on the drivers side?

My suggestion is to either call Sunpro and see if there is a smaller sending unit you can get....or...replace the front t-stat housing with one from a 94 or newer 4.0. That housing has a 1/2" NPT hole for the temp sending unit....that is about as clean a retrofit you can do.
post #3 of (permalink) Old 09-11-2006, 09:52 AM
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Re: Sunpro Gauge

I installed my Sunpro gauge in the intake manifold, in the same place as the EGR Coolant Temperature Override Valve(CTO).
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post #4 of (permalink) Old 09-11-2006, 10:24 AM
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Re: Sunpro Gauge

I installed my mechanical gauge sender in the driver's side of the engine block and plugged the factory location. I can get you a pic if necesary. [img]/ubbthreads/images/graemlins/smile.gif[/img]
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post #5 of (permalink) Old 09-11-2006, 10:49 AM
 
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Re: Sunpro Gauge

I also installed my mech. gauge in the intake manifold. I left the original alone, they both work. I just prefer to know what the temp is.
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post #6 of (permalink) Old 09-11-2006, 03:22 PM Thread Starter
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Re: Sunpro Gauge

If you get rid of the CTO what did you do for the evaporation canister ported vacuum line (the one from the cto).
Im not sure if I should plug it or hook it into another ported vacuum line.
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post #7 of (permalink) Old 09-11-2006, 04:20 PM
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Re: Sunpro Gauge

[ QUOTE ]
If you get rid of the CTO what did you do for the evaporation canister ported vacuum line (the one from the cto).
Im not sure if I should plug it or hook it into another ported vacuum line.

[/ QUOTE ]

It's pretty simple, I installed fuel injection! [img]/ubbthreads/images/graemlins/grin.gif[/img]
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post #8 of (permalink) Old 09-11-2006, 05:26 PM Thread Starter
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Re: Sunpro Gauge

DDAWG, a thermostat housing off of a 4.0L will fit onto a 4.2L head?
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post #9 of (permalink) Old 09-11-2006, 06:21 PM
 
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Re: Sunpro Gauge

I know the one off my 4.2 head fit on my 4.0 head when I did the swap, no problem.
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post #10 of (permalink) Old 09-11-2006, 06:56 PM
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Re: Sunpro Gauge

Yep....
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