Installation:

-- Main part --
1) Install revp50ep1 folder to: Grand Theft Auto V\mods\update\x64\dlcpacks
2) Install into Grand Theft Auto V\mods\update\update.rpf\common\data\dlclist.xml this line:
<Item>dlcpacks:/revp50ep1/</Item>
at the end of list, but before of </Paths>

-- Optional part A (If you got problems with Emergency Lights) --
3) Implement LIGHTS_FIX if you have problems with emissives

-- Optional part B (if you want late 50s style emergency license plate) --
4) Install with replacement of existing file vehshare.rpf to Grand Theft Auto V\update\x64\dlcpacks\patch2023_02\dlc.rpf\x64\levels\gta5\vehicles.rpf\
5) Replace these parameters of file carcols.ymt in Grand Theft Auto V\update\update.rpf\x64\data\
      <Item>
        <TextureSetName>Police guv plate</TextureSetName>
        <DiffuseMapName>plate05</DiffuseMapName>
        <NormalMapName>plate05_n</NormalMapName>
        <FontExtents x="0.08000000" y="0.35500000" z="0.92000000" w="0.81600000"/>
        <MaxLettersOnPlate x="7.00000000" y="1.00000000"/>
        <FontColor value="0xFF0F2352"/>
        <FontOutlineColor value="0x00FFFFFF"/>
        <IsFontOutlineEnabled value="false"/>
        <FontOutlineMinMaxDepth x="0.47500000" y="0.50000000"/>
      </Item>
To these:
      <Item>
        <TextureSetName>Police guv plate</TextureSetName>
        <DiffuseMapName>plate05</DiffuseMapName>
        <NormalMapName>plate05_n</NormalMapName>
        <FontExtents x="0.25000000" y="0.35500000" z="0.92000000" w="0.81600000"/>
        <MaxLettersOnPlate x="6.00000000" y="1.00000000"/>
        <FontColor value="0xFF000000"/>
        <FontOutlineColor value="0xFF000000"/>
        <IsFontOutlineEnabled value="false"/>
        <FontOutlineMinMaxDepth x="0.10000000" y="0.50000000"/>
      </Item>

-- Optional part C (if you want dials, wipers and some other features to work on all cars) --
6) Install VehFuncs V mod by RealZolika1351 - https://www.gta5-mods.com/scripts/vehfuncs-v
7) Install VehFuncsV folder which in Optonals folder to: Grand Theft Auto V root directory (location of gta5.exe), merge with existing VehFuncsV folder

Added vehicles list:

San Andreas Highway Patrol Units:

fdx47hwy - Ford Super DeLuxe '47
fdx49hwy - Ford DeLuxe '49
mnl53hwy - Ford Mainline '53
chv55hwy - Chevrolet 150 '55
svy57hwy - Plymouth Savoy '57

San Andreas State Park Units:

j50rgr - Jeep Willys 4x4 '50

Lifeguard Units:

j50lgrd - Jeep Willys 4x4 '50

Contacts:
Email: johnlozano228@gmail.com
Blog: https://blogger-lozano71.blogspot.com/
YouTube: https://www.youtube.com/channel/UCVONyOcHe63HRgv0webZEMQ
Boosty: https://boosty.to/lozanosworkshop/donate 
Discord: https://discord.gg/pfdT4nR
PayPal (inactive): https://www.paypal.me/Lozano71

Credits:

Emergency lights:

Most of emergency lights and equipment 3D Models: solo, Lundy, 11john11

Overhauling of emergency lights, creation of carcols.meta and radical edits of 3D Models: Lozano71

Winchester M1912: - Morrice, toitoine66

BCSO Star Remaster: - KekAnTing

Other liveries primitives: - RDE Team, Vanillaworks, AlexVonShep

All liveries and assembling of pack: Lozano71

Consultations, help with project: GreenAid

Ford Super DeLuxe '47

Original model: LA Noire, Forza
Conversion to V, edits: JKhan
Further work, tweaks, all data: GreenAid
Rework, more edits, more fixes: Lozano71

Ford DeLuxe '49

Original model: 1949 Ford for Rigs of Rods by Gabester
Conversion to GTA IV, lots of edits: Mike_94
Conversion to GTA V, further edits: GreenAid 
Minor edits: Lozano71

Ford Mainline '53

Original models: StratumX, Mad_Driver10
Conversion to V: GreenAid
Edits, tweaks, data: GreenAid
Tire textures: Staghound, ReNNie, GreenAid
Additional edits, template fix: Lozano71

Chevrolet 150 '55

Original model: FM7, provided by Zievs and Gerlach
Initial work, merging underbody: Gerlach
Conversion: GreenAid
Livery 1 and texture help: Oh Deer 
Minor fixes, partial template: Lozano71

Plymouth Savoy '57

Original model for GTA SA: StratumX
Conversion: GreenAid
Minor fixes, partial template: Lozano71

Jeep Willys 4x4 '50

Original models: StratumX
Conversion to V, edits, tweaks: GreenAid 
Minor fixes, partial template: Lozano71

Credits list may lack some nicknames, so, If I missed someone, or you see errors in credits, please note me about that, I’ll be happy to fix that, because my work was impossible without these authors.