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Username Post: Adding After Market Gauges        (Topic#364110)
drice0517 
Newbie
Posts: 12

Reg: 01-21-21
01-24-21 06:48 PM - Post#2812852    

I would like to add an additional oil pressure, temp, and volt meter gauge to my GMC truck. Looking at the Stewart Warner and Jegs three gauge sets seen on some muscle cars and hot rods. My stock in-dash gauges work, but I'm not sure how accurate they are. Is there a way to have both sets of gauges work at the same time or will I have to disconnect the dash set to connect the new set. Appreciate any help or information...!

1985 GMC Sierra Classic, C1500
305 CID, 4 bbl Quad
Stock Configuration


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25367
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-25-21 05:41 AM - Post#2812872    
    In response to drice0517

Welcome to the site.
A three pod pillar is now available.

You can mount new gauges in different ways.

My plan is to replace stock gauges using a stock bezel.

Will the new gauges use stock sensors? Some gauges can use stock sensors. Others can not. Blocks do have different ports to use additional gauges. For example, the head ports for temps. The left head port is a dash reading. The right head port on mine is used to control electric fan activation. Oil pressure can only be measured at one port. However, using fittings you can add an additional port.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
drice0517 
Newbie
Posts: 12

Reg: 01-21-21
01-25-21 02:40 PM - Post#2812908    
    In response to gchemist

Thanks..hadn't thought about using additional fittings for the oil pressure gauge. My stock gauge goes right up to 60+ (top range of my gauge) and comes back down at idle to about 30-35. Guess it's a good sign that it's at least going up when the RPMs go up. The temp gauge goes up to about 180-190 and stays right around there. It seems to work ok but I just installed a new radiator and water pump and thought the gauge might read a little differently, but again, at least it goes up when the engine warms up. Guess it wouldn't hurt to just disconnect the stock gauges and use any stock sensors that are in good shape for the new gauges. If I run it a few weeks and everything reads ok I'll reconnect the stock gauges anyway. I'll look into some mounting options, appreciate your time, and have a good one...!

1985 GMC Sierra Classic, C1500
305 CID, 4 bbl Quad
Stock Configuration


 
wagonman100 
Site Ambassador
Posts: 15018

Loc: Baltimore, MD
Reg: 11-27-04
01-25-21 06:39 PM - Post#2812936    
    In response to drice0517

Sounds like your stock gauges are accurate. The temperature gauge won’t read any differently even with a new water pump and radiator even if they are capable of making the motor run cooler because you thermostat is still the same one as before. There is another port down near the oil filter on the side of the block that you can run a second oil pressure gauge off of, if I remember correctly.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
drice0517 
Newbie
Posts: 12

Reg: 01-21-21
01-26-21 07:07 PM - Post#2813047    
    In response to wagonman100

Thanks for the reply...I was actually thinking my stock gauge might be reading on the low side and thought it might read a little higher after the radiator and water pump install...just seems to be reading low. Not sure what thermostat I have, maybe should've changed it out too while I was at it.
I'll check on that port near the filter. Be nice if I can do that. Like I said, if new gauges are reading close, I'll go back to the stock set up. I just want to make sure of the numbers.

1985 GMC Sierra Classic, C1500
305 CID, 4 bbl Quad
Stock Configuration


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25367
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-27-21 06:03 AM - Post#2813059    
    In response to drice0517

Cheap tools from Harbor Freight can help. Use an IR thermometer for temp readings. You can read individual exhaust cylinders too. An oil pressure kit can test actual pressure. Your best bet is to replace an old oil pressure sensor. Over time, gunk builds up inside it causing false readings. Grab a voltmeter for testing different locations for voltage. You can buy a cheap voltmeter test to plug into the cigarette lighter too. Some Blue Tooth plug ings can read voltage and broadcast to a set station.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
drice0517 
Newbie
Posts: 12

Reg: 01-21-21
01-29-21 05:38 PM - Post#2813228    
    In response to gchemist

Appreciate the information...I'll check on that IR tool...keep on truckin'...!

1985 GMC Sierra Classic, C1500
305 CID, 4 bbl Quad
Stock Configuration


 
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