Whos the 73 up Tach Dash expert? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Desert Rat** · 07-07-2002, 10:02 PM

I have 2 Tach Dashes 1 with a Volt Gauge on with the Amp gauge.I have a 79 Blazer,and it has the volt gauge cluster w/o tach.I want to put in the amp gauge unit becasuse its extremly nice,not the usual junkyard find,but i know i cant stick a amp gauge cluster in a volt gauge truck without some meltdown.Can i swap the amp and volt gauge around and then the circuit board?They both have mechanical oil pressure.Do i have any otions here,the one tach dash that i need in there i dont consider nice enough to put in my Blazer.They both work.the one cluster looks like it just came out of box,other been in a truck sitting for 10 years,some fading etc.Any help appreciated,i know theres someone on here thats a 73 up tach expert!!!

**crossy** · 07-10-2002, 12:10 AM

UHHHHH expert . I,m still learning after 15+ years of 73-87"s and 5 years of these blasted tach dashes ,but here goes. put the VOLT gauge & correct PC in and you'll only be half way there. The mech oil pressure dashes are wired(PC -wise) totally different from elect oil pressure gauge ones . I just helped a guy do this and it took me many hours to figure out the wiring. If you find a tach dash with elect. oil pressure and volt gauge it will plug right in then you wire the tach seperately . I did keep a draft of the wiring info I sent him. sorry no EASY fix on this one. DAVE.

**Desert Rat** · 07-10-2002, 04:03 PM

Crap think ill sell them both and buy a nice 79 one.if i remember right one came out of a 78 other i swore 79 only visual front differance is amp/volt gauge.Or go with the white gauge sticker kit i have.

**Desert Rat** · 07-10-2002, 04:04 PM

both of these are mechanical oil pressure

**raggedjim** · 07-10-2002, 05:42 PM

Desert Rat, If you decide to sell I may be interested. I have a '77 2wd blazer I wouldn't mind having a tach in.

07-07-2002, 10:02 PM	#1
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	Whos the 73 up Tach Dash expert? I have 2 Tach Dashes 1 with a Volt Gauge on with the Amp gauge.I have a 79 Blazer,and it has the volt gauge cluster w/o tach.I want to put in the amp gauge unit becasuse its extremly nice,not the usual junkyard find,but i know i cant stick a amp gauge cluster in a volt gauge truck without some meltdown.Can i swap the amp and volt gauge around and then the circuit board?They both have mechanical oil pressure.Do i have any otions here,the one tach dash that i need in there i dont consider nice enough to put in my Blazer.They both work.the one cluster looks like it just came out of box,other been in a truck sitting for 10 years,some fading etc.Any help appreciated,i know theres someone on here thats a 73 up tach expert!!!

07-10-2002, 12:10 AM	#2
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	tach dahes UHHHHH expert . I,m still learning after 15+ years of 73-87"s and 5 years of these blasted tach dashes ,but here goes. put the VOLT gauge & correct PC in and you'll only be half way there. The mech oil pressure dashes are wired(PC -wise) totally different from elect oil pressure gauge ones . I just helped a guy do this and it took me many hours to figure out the wiring. If you find a tach dash with elect. oil pressure and volt gauge it will plug right in then you wire the tach seperately . I did keep a draft of the wiring info I sent him. sorry no EASY fix on this one. DAVE. __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

07-10-2002, 05:42 PM	#5
raggedjim Senior Member Join Date: Jun 2002 Location: Murray, Kentucky Posts: 3,484	Desert Rat, If you decide to sell I may be interested. I have a '77 2wd blazer I wouldn't mind having a tach in. __________________ Roger '68 Short step - https://67-72chevytrucks.com/vboard/...d.php?t=849675 '69 ('70?) 2wd Blazer '70 GMC Jimmy 2wd '73 Firebird - https://67-72chevytrucks.com/vboard/...d.php?t=853203 Ideas - https://67-72chevytrucks.com/vboard/...d.php?t=851743

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07-10-2002, 04:03 PM	#3
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	Crap think ill sell them both and buy a nice 79 one.if i remember right one came out of a 78 other i swore 79 only visual front differance is amp/volt gauge.Or go with the white gauge sticker kit i have.

07-10-2002, 04:04 PM	#4
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	both of these are mechanical oil pressure



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